Class reference methods for Generic6DOFJoint3D are incorrect

**Your Godot version:**
4.2.2

**Issue description:**
Class reference methods for Generic6DOFJoint3D are incorrect.
The reference states there is a set/get param/flags method for each axis, but this is not the case. Set/get param/flags takes an axis as an argument.
If this is a convention specific to Godot, there is nothing explaining so (at least nothing I can find). If so, a solution would be to add an explanation on the contributing to the documentation section of the contributing page or all classes page. Otherwise, the class reference should be updated.

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/contributing/ways_to_contribute.html#contributing-to-the-documentation
https://docs.godotengine.org/en/stable/classes/index.html#
https://docs.godotengine.org/en/stable/classes/class_generic6dofjoint3d.html
https://github.com/godotengine/godot/blob/4.2/servers/physics_3d/joints/godot_generic_6dof_joint_3d.h