Add docstring for Mobject.rotate and Refactor Rotating and also add its docstring

[irvanalhaq9]

Overview: What does this pull request change?

1. Adding detailed docstrings for Mobject.rotate().
2. Refactor Rotating, and add detailed docstring, and adjust Rotating parameter in Example Gallery.
   Breaking change:
   • renames the radians parameter to angle to be consistent with the .rotate() and the Rotate class.
   • reorders the arguments in the Rotating to be consistent with the .rotate() and the Rotate class.
     Before: Rotating(mobject, axis, radians, ...)
     After : Rotating(mobject, angle, axis, ...)

Links to added or changed documentation pages

1. rotate: https://manimce--4147.org.readthedocs.build/en/4147/reference/manim.mobject.mobject.Mobject.html#manim.mobject.mobject.Mobject.rotate
2. Rotating: https://manimce--4147.org.readthedocs.build/en/4147/reference/manim.animation.rotation.Rotating.html#manim.animation.rotation.Rotating

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[chopan050]

Thanks! I like the changes in general.

Honestly, I'm not sure whether Rotating should even exist in the first place, as it's very similar to Rotate with a hardcoded rate_func=linear and run_time=5 (now run_time=2). However, that's a discussion for another day.

I do have one specific question:

[chopan050]

What is the reason behind this change?

[irvanalhaq9]

I changed it to 2 seconds because 5 seconds felt unnecessarily long. As far as I can tell, there wasn’t a specific reason for choosing 5 seconds. Most animation classes in Manim default to 1 or 2 seconds (like DrawBorderThenFill, Write, FocusOn, Wiggle, ApplyWave, LaggedStartMap), so 2 seconds feels more consistent.

I'm also fine with keeping it at 5 seconds if that’s the preferred default — just let me know.