Documentation issue: Mouse motion example problem

**Your Godot version:**v4.0.3.stable.official [5222a99f5]

**Issue description:**The example GDScript code of Mouse motin doesn't work well if position of node is not equal to global_position at the begining.Is there any other considers ?Or replace "$Sprite2D.position" with "$Sprite2D.global_position" is a better idea

**URL to the documentation page:**https://docs.godotengine.org/en/4.0/tutorials/inputs/input_examples.html#mouse-events

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