Clarify input for `apply_torque` and `apply_torque_impulse`

**Your Godot version:**

4.1.2

**Issue description:**

These methods take a `Vector3` parameter, but it's not specified what this vector means exactly.

Based on some quick experiments I'm guessing it's something like the following:

- the direction of the vector defines the axis to rotate around
- the direction of rotation around the axis is clockwise looking in the direction of the axis (follows the right hand rule?)
- the magnitude of the vector specifies the amount of torque

Is that correct? If so I can try making a PR to add it to the function descriptions

**URL to the documentation page (if already existing):**

- https://docs.godotengine.org/en/stable/classes/class_physicsdirectbodystate3d.html#class-physicsdirectbodystate3d-method-apply-torque
- https://docs.godotengine.org/en/stable/classes/class_rigidbody3d.html#class-rigidbody3d-method-apply-torque