Potentially misleading documentation for Camera3D.get_camera_projection()

**Your Godot version:**
4.3

**Issue description:**
The documentation for `Camera3D.get_camera_projection()` states that the returned projection is the one "this camera uses to render to its associated viewport". This is not entirely accurate, though, since the returned projection does not include the depth correction applied in the Vulkan backend. This behavior might confuse some users when trying to use said projection, as the produced depth-values will be in [-1, 1] instead of the otherwise expected [1, 0] range.

I already added a comment on the documentation page noting this issue, but would propose to include a similar note into the documentation to make this more clear.

**URL to the documentation page:**

https://docs.godotengine.org/en/4.3/classes/class_camera3d.html