Improve docstring for interpolate method in Mobject class

[irvanalhaq9]

Overview: What does this pull request change?

Improve docstring for interpolate method in Mobject class

Improvements:

This PR improves the documentation by explicitly stating that mobject1 and mobject2 must have the same number of points to avoid errors. It also provides a clear recommendation to use .align_points() when necessary.

Additionally, the updated example is more representative, demonstrating both cases: when point alignment is not needed (e.g., Dot) and when it is required (e.g., Line → Square). This makes it easier for users to understand when manual alignment is necessary.

A See Also section has been added to reference related methods, helping users explore relevant functionality more efficiently.

Links to added or changed documentation pages

Method interpolate: https://manimce--4149.org.readthedocs.build/en/4149/reference/manim.mobject.mobject.Mobject.html#manim.mobject.mobject.Mobject.interpolate

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