Document custom mouse cursors larger than 128×128 potentially having issues

doc/classes/Input.xml

@@ -300,7 +300,7 @@
 			<param index="2" name="hotspot" type="Vector2" default="Vector2(0, 0)" />
 			<description>
 				Sets a custom mouse cursor image, which is only visible inside the game window. The hotspot can also be specified. Passing [code]null[/code] to the image parameter resets to the system cursor. See [enum CursorShape] for the list of shapes.
-				[param image]'s size must be lower than 256×256.
+				[param image]'s size must be lower than or equal to 256×256. To avoid rendering issues, sizes lower than or equal to 128×128 are recommended.
 				[param hotspot] must be within [param image]'s size.
 				[b]Note:[/b] [AnimatedTexture]s aren't supported as custom mouse cursors. If using an [AnimatedTexture], only the first frame will be displayed.
 				[b]Note:[/b] Only images imported with the [b]Lossless[/b], [b]Lossy[/b] or [b]Uncompressed[/b] compression modes are supported. The [b]Video RAM[/b] compression mode can't be used for custom cursors.