change system variable to variable

Author: hx2A

py5_docs/Reference/api_en/Py5Graphics_height.txt

@@ -7,6 +7,6 @@ pclass = PGraphics
 processing_name = height
 
 @@ description
-System variable that stores the height of the Py5Graphics drawing surface. This value is set when creating the `Py5Graphics` object with the [](sketch_create_graphics) method. For example, `create_graphics(320, 240)` sets the `height` variable to the value 240.
+Variable that stores the height of the Py5Graphics drawing surface. This value is set when creating the `Py5Graphics` object with the [](sketch_create_graphics) method. For example, `create_graphics(320, 240)` sets the `height` variable to the value 240.
 
 This field is the same as [](sketch_height) but linked to a `Py5Graphics` object. To see example code for how it can be used, see [](sketch_height).

py5_docs/Reference/api_en/Py5Graphics_width.txt

@@ -7,6 +7,6 @@ pclass = PGraphics
 processing_name = width
 
 @@ description
-System variable that stores the width of the Py5Graphics drawing surface. This value is set when creating the `Py5Graphics` object with the [](sketch_create_graphics) method. For example, `create_graphics(320, 240)` sets the `width` variable to the value 320.
+Variable that stores the width of the Py5Graphics drawing surface. This value is set when creating the `Py5Graphics` object with the [](sketch_create_graphics) method. For example, `create_graphics(320, 240)` sets the `width` variable to the value 320.
 
 This field is the same as [](sketch_width) but linked to a `Py5Graphics` object. To see example code for how it can be used, see [](sketch_width).

py5_docs/Reference/api_en/Sketch_display_height.txt

@@ -7,7 +7,7 @@ pclass = PApplet
 processing_name = displayHeight
 
 @@ description
-System variable that stores the height of the entire screen display. This can be used to run a full-screen program on any display size, but calling [](sketch_full_screen) is usually a better choice.
+Variable that stores the height of the entire screen display. This can be used to run a full-screen program on any display size, but calling [](sketch_full_screen) is usually a better choice.
 
 @@ example
 def setup():

py5_docs/Reference/api_en/Sketch_display_width.txt

@@ -7,7 +7,7 @@ pclass = PApplet
 processing_name = displayWidth
 
 @@ description
-System variable that stores the width of the entire screen display. This can be used to run a full-screen program on any display size, but calling [](sketch_full_screen) is usually a better choice.
+Variable that stores the width of the entire screen display. This can be used to run a full-screen program on any display size, but calling [](sketch_full_screen) is usually a better choice.
 
 @@ example
 def setup():

py5_docs/Reference/api_en/Sketch_height.txt

@@ -7,7 +7,7 @@ pclass = PApplet
 processing_name = height
 
 @@ description
-System variable that stores the height of the display window. This value is set by the second parameter of the [](sketch_size) function. For example, the function call `size(320, 240)` sets the `height` variable to the value 240. The value of `height` defaults to 100 if [](sketch_size) is not used in a program.
+Variable that stores the height of the display window. This value is set by the second parameter of the [](sketch_size) function. For example, the function call `size(320, 240)` sets the `height` variable to the value 240. The value of `height` defaults to 100 if [](sketch_size) is not used in a program.
 
 @@ example
 image = Sketch_height_0.png

py5_docs/Reference/api_en/Sketch_width.txt

@@ -7,7 +7,7 @@ pclass = PApplet
 processing_name = width
 
 @@ description
-System variable that stores the width of the display window. This value is set by the first parameter of the [](sketch_size) function. For example, the function call `size(320, 240)` sets the `width` variable to the value 320. The value of `width` defaults to 100 if [](sketch_size) is not used in a program.
+Variable that stores the width of the display window. This value is set by the first parameter of the [](sketch_size) function. For example, the function call `size(320, 240)` sets the `width` variable to the value 320. The value of `width` defaults to 100 if [](sketch_size) is not used in a program.
 
 @@ example
 image = Sketch_width_0.png