docs: update

Author: jcs090218

docs/ScriptReference/UI/JCS_Canvas.md

@@ -32,3 +32,4 @@ Control of the canvas component.
 | Show                       | Show the canvas, so it's visible on the screen.               |
 | Hide                       | Hide the canvas, so it's invisible on the screen.             |
 | ToggleVisibility           | Toggle the canvas' visibility.                                |
+| IsFading                   | Return true if the canvas is fading in/out.                   |

docs/ScriptReference/UI/JCS_CanvasComp.md

@@ -20,3 +20,4 @@ Component that requires the component `JCS_Canvas` without actually inherit the
 | Show             | Show the canvas, so it's visible on the screen.   |
 | Hide             | Hide the canvas, so it's invisible on the screen. |
 | ToggleVisibility | Toggle the canvas' visibility.                    |
+| IsFading         | Return true if the canvas is fading in/out.       |