Fix flake node documentations (AcademySoftwareFoundation#2953)

Fix `flake2d` and `flake3d` node documentations.

Author: msuzuki-nvidia

documents/Specification/MaterialX.StandardNodes.md

@@ -517,38 +517,38 @@ A single node supporting 3D Perlin, Cell, Worley or Fractal noise in a unified i
 ### `flake2d`
 Generates a procedural flake pattern in 2D space, suitable for simulating metallic flakes in materials such as car paint.
 
-|Port         |Description                                                                                        |Type   |Default |
-|-------------|---------------------------------------------------------------------------------------------------|-------|--------|
-|`texcoord`   |The 2D texture coordinate at which the flake pattern is evaluated                                  |vector2|_UV0_   |
-|`size`       |The size of individual flakes, with smaller values producing larger flakes                         |float  |0.01    |
-|`roughness`  |The surface roughness of individual flakes, controlling the variation in normal                    |float  |0.1     |
-|`coverage`   |The density of flakes in the pattern, ranging from 0.0 (no flakes) to 1.0 (maximum)                |float  |0.5     |
-|`normal`     |The surface normal vector used as the base for flake normal perturbations                          |vector3|_Nworld_|
-|`tangent`    |The surface tangent vector, used to construct the tangent space                                    |vector3|_Tworld_|
-|`bitangent`  |The surface bitangent vector, used to construct the tangent space                                  |vector3|_Bworld_|
-|`id`         |Output: unique identifier for each flake. 0 for no flake                                           |integer|0       |
-|`rand`       |Output: random value per flake for additional variation. 0.0 for no flake                          |float  |0.0     |
-|`presence`   |Output: presence per flake; a depth-like value (higher is closer to the surface). 0.0 for no flake.|float  |0.0     |
-|`flakenormal`|Output: the computed flake normal. Base normal if no flake present                                 |vector3|_Nworld_|
+|Port         |Description                                                                                                   |Type   |Default |
+|-------------|--------------------------------------------------------------------------------------------------------------|-------|--------|
+|`texcoord`   |The 2D texture coordinate at which the flake pattern is evaluated                                             |vector2|_UV0_   |
+|`size`       |The size of individual flakes, with smaller values producing smaller flakes                                   |float  |0.01    |
+|`roughness`  |The surface roughness of individual flakes, controlling the variation in normal                               |float  |0.1     |
+|`coverage`   |The density of flakes in the pattern, ranging from 0.0 (no flakes) to 1.0 (maximum)                           |float  |0.5     |
+|`normal`     |The surface normal vector used as the base for flake normal perturbations                                     |vector3|_Nworld_|
+|`tangent`    |The surface tangent vector, used to construct the tangent space                                               |vector3|_Tworld_|
+|`bitangent`  |The surface bitangent vector, used to construct the tangent space                                             |vector3|_Bworld_|
+|`id`         |Output: stable pseudo-random integer label for the selected flake, not guaranteed to be unique. 0 for no flake|integer|0       |
+|`rand`       |Output: random value per flake for additional variation. 0.0 for no flake                                     |float  |0.0     |
+|`presence`   |Output: presence per flake; a depth-like value (higher is closer to the surface). 0.0 for no flake            |float  |0.0     |
+|`flakenormal`|Output: the computed flake normal. Base normal if no flake present                                            |vector3|_Nworld_|
 
 <a id="node-flake3d"> </a>
 
 ### `flake3d`
 Generates a procedural flake pattern in 3D space, suitable for simulating metallic flakes in materials such as car paint.
 
-|Port         |Description                                                                                        |Type   |Default  |
-|-------------|---------------------------------------------------------------------------------------------------|-------|---------|
-|`position`   |The 3D position at which the flake pattern is evaluated                                            |vector3|_Pobject_|
-|`size`       |The size of individual flakes, with smaller values producing larger flakes                         |float  |0.01     |
-|`roughness`  |The surface roughness of individual flakes, controlling the variation in normal                    |float  |0.1      |
-|`coverage`   |The density of flakes in the pattern, ranging from 0.0 (no flakes) to 1.0 (maximum)                |float  |0.5      |
-|`normal`     |The surface normal vector used as the base for flake normal perturbations                          |vector3|_Nworld_ |
-|`tangent`    |The surface tangent vector, used to construct the tangent space                                    |vector3|_Tworld_ |
-|`bitangent`  |The surface bitangent vector, used to construct the tangent space                                  |vector3|_Bworld_ |
-|`id`         |Output: unique identifier for each flake. 0 for no flake                                           |integer|0        |
-|`rand`       |Output: random value per flake for additional variation. 0.0 for no flake                          |float  |0.0      |
-|`presence`   |Output: presence per flake; a depth-like value (higher is closer to the surface). 0.0 for no flake.|float  |0.0      |
-|`flakenormal`|Output: the computed flake normal. Base normal if no flake present                                 |vector3|_Nworld_ |
+|Port         |Description                                                                                                   |Type   |Default  |
+|-------------|--------------------------------------------------------------------------------------------------------------|-------|---------|
+|`position`   |The 3D position at which the flake pattern is evaluated                                                       |vector3|_Pobject_|
+|`size`       |The size of individual flakes, with smaller values producing smaller flakes                                   |float  |0.01     |
+|`roughness`  |The surface roughness of individual flakes, controlling the variation in normal                               |float  |0.1      |
+|`coverage`   |The density of flakes in the pattern, ranging from 0.0 (no flakes) to 1.0 (maximum)                           |float  |0.5      |
+|`normal`     |The surface normal vector used as the base for flake normal perturbations                                     |vector3|_Nworld_ |
+|`tangent`    |The surface tangent vector, used to construct the tangent space                                               |vector3|_Tworld_ |
+|`bitangent`  |The surface bitangent vector, used to construct the tangent space                                             |vector3|_Bworld_ |
+|`id`         |Output: stable pseudo-random integer label for the selected flake, not guaranteed to be unique. 0 for no flake|integer|0        |
+|`rand`       |Output: random value per flake for additional variation. 0.0 for no flake                                     |float  |0.0      |
+|`presence`   |Output: presence per flake; a depth-like value (higher is closer to the surface). 0.0 for no flake            |float  |0.0      |
+|`flakenormal`|Output: the computed flake normal. Base normal if no flake present                                            |vector3|_Nworld_ |
 
 ### Noise Node Notes
 

libraries/stdlib/stdlib_defs.mtlx

@@ -1239,7 +1239,7 @@
 
   <!--
     Node: <flake2d>
-    3D flake pattern generator.
+    2D flake pattern generator.
   -->
   <nodedef name="ND_flake2d" node="flake2d" nodegroup="procedural2d">
     <input name="size" type="float" value="0.01" doc="Size of individual flakes." />
@@ -1249,15 +1249,15 @@
     <input name="normal" type="vector3" defaultgeomprop="Nworld" doc="Surface normal; defaults to the current world-space normal." />
     <input name="tangent" type="vector3" defaultgeomprop="Tworld" doc="Surface tangent vector, defaults to the current world-space tangent vector." />
     <input name="bitangent" type="vector3" defaultgeomprop="Bworld" doc="Surface bitangent vector, defaults to the current world-space bitangent vector." />
-    <output name="id" type="integer" default="0" doc="Unique identifier for each flake (0 for no flake)." />
+    <output name="id" type="integer" default="0" doc="Stable pseudo-random integer label for the selected flake, not guaranteed to be unique (0 for no flake)." />
     <output name="rand" type="float" default="0.0" doc="Random value per flake for additional variation (0 for no flake)." />
     <output name="presence" type="float" default="0.0" doc="Depth-based presence value per flake for additional variation (0 for no flake)." />
     <output name="flakenormal" type="vector3" default="Nworld" doc="The computed flake normal (base normal if no flake present)." />
   </nodedef>
 
   <!--
     Node: <flake3d>
-    2D flake pattern generator.
+    3D flake pattern generator.
   -->
   <nodedef name="ND_flake3d" node="flake3d" nodegroup="procedural3d">
     <input name="size" type="float" value="0.01" doc="Size of individual flakes." />
@@ -1267,7 +1267,7 @@
     <input name="normal" type="vector3" defaultgeomprop="Nworld" doc="Surface normal; defaults to the current world-space normal." />
     <input name="tangent" type="vector3" defaultgeomprop="Tworld" doc="Surface tangent vector, defaults to the current world-space tangent vector." />
     <input name="bitangent" type="vector3" defaultgeomprop="Bworld" doc="Surface bitangent vector, defaults to the current world-space bitangent vector." />
-    <output name="id" type="integer" default="0" doc="Unique identifier for each flake (0 for no flake)." />
+    <output name="id" type="integer" default="0" doc="Stable pseudo-random integer label for the selected flake, not guaranteed to be unique (0 for no flake)." />
     <output name="rand" type="float" default="0.0" doc="Random value per flake for additional variation (0 for no flake)." />
     <output name="presence" type="float" default="0.0" doc="Depth-based presence value per flake for additional variation (0 for no flake)." />
     <output name="flakenormal" type="vector3" default="Nworld" doc="The computed flake normal (base normal if no flake present)." />