Automatic update of the reference pages [skip ci]

Author: GDevelop documentation CI

docs/gdevelop5/extensions/fire-bullet/index.md

@@ -7,9 +7,9 @@ Fire bullets, manage ammo, reloading and overheating.
 
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-This extension allows objects to fire bullets.
+This extension allows objects to fire bullets. To use it, add the behavior to the object that will shoot, then use the provided action to launch another object as the bullet.
 
-It handles:
+The properties of the behavior can be used to customize:
 
 - Cooldown between shots
 - Firing multiple bullets at a time ([open the project online](https://editor.gdevelop.io/?project=example://fire-bullet))
@@ -32,7 +32,7 @@ A simple example shows how to make firing patterns ([open the project online](ht
 
 ## Fire bullets 
 
-Fire bullets, manage ammo, reloading, and overheating. 
+Fire bullets, manage ammo, reloading, and overheating. Once added to your object that must shoot, use the behavior action in your events to fire another object as a bullet. 
 
 ### Behavior actions
 

docs/gdevelop5/extensions/linear-movement/index.md

@@ -20,15 +20,48 @@ It can be used for simple enemies or bullets. It's usually not adapted for playe
 
 Move objects on a straight line. 
 
-_No expressions for this behavior._
+### Behavior actions
 
+**Speed on X axis**  
+Change the speed on X axis of the object.
+
+**Speed on Y axis**  
+Change the speed on Y axis of the object.
+
+### Behavior conditions
+
+**Speed on X axis**  
+Compare the speed on X axis of the object.
+
+**Speed on Y axis**  
+Compare the speed on Y axis of the object.
+
+### Behavior expressions
+
+| Expression | Description |  |
+|-----|-----|-----|
+| `Object.LinearMovement::SpeedX()` | Return the speed on X axis of the object. ||
+| `Object.LinearMovement::SpeedY()` | Return the speed on Y axis of the object. ||
 
 ## Linear movement by angle 
 
 Move objects ahead according to their angle. 
 
-_No expressions for this behavior._
+### Behavior actions
+
+**Speed**  
+Change the speed of the object.
+
+### Behavior conditions
+
+**Speed**  
+Compare the speed of the object.
+
+### Behavior expressions
 
+| Expression | Description |  |
+|-----|-----|-----|
+| `Object.LinearMovementByAngle::Speed()` | Return the speed of the object. ||
 
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