Output range documentation for Vector3.signed_angle_to

**Your Godot version:** 4.4.1

**Issue description:** It would be helpful if the documentation for the signed_angle_to function of the Vector3 class would contain its output range, specifically that it outputs PI for antiparallel Vectors and never -PI

**URL to the documentation page (if already existing):** https://docs.godotengine.org/en/stable/classes/class_vector3.html#class-vector3-method-signed-angle-to