GetAngleTo (Node2D)

**Your Godot version:**
3.2.4 rc3 mono

**Issue description:**
The documentation is not explicit.
The documentation should point out that the difference is not between the position of the node and the vector in parameters, but between the angle between its Rotation and the position of the vector received in parameters.

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/classes/class_node2d.html#class-node2d-method-get-angle-to