docs: Update

Author: jcs090218

docs/ScriptReference/UI/JCS_CanvasComp.md

@@ -7,3 +7,12 @@ Component that requires the component `JCS_Canvas` without actually inherit the
 | Name    | Description                           |
 |:--------|:--------------------------------------|
 | mCanvas | The canvas this component to control. |
+
+## Functions
+
+| Name             | Description                                       |
+|:-----------------|:--------------------------------------------------|
+| IsShown          | Return true if the canvas is currently visible.   |
+| 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.                    |