docs: improve NumPy-style docstrings in render module

[AlgoFoe]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

• The codebase lacked consistent docstrings, making Sphinx autodoc output incomplete and hard to read.

What does this PR do?

• Adds/updates NumPy-style docstrings (module, class, method, function level) in render.py.

References

• Part of Issue-96

How has this PR been tested?

• No functional changes, existing tests pass.

Is this a breaking change?

• No.

Does this PR require an update to the documentation?

• Yes.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.26%. Comparing base (55c8b6c) to head (53966da).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #454      +/-   ##
==========================================
- Coverage   89.41%   88.26%   -1.15%     
==========================================
  Files          27       27              
  Lines        1285     1287       +2     
==========================================
- Hits         1149     1136      -13     
- Misses        136      151      +15     

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[IgorTatarnikov]

This looks great, just a few small comments and then I think it'll be good to go!

[alessandrofelder]

@AlgoFoe maybe while you are fixing **kwargs typehints, you could also fix it at

brainrender/brainrender/atlas.py

Line 143 in 9bf02d3

**kwargs: object,

(sorry for missing this when I reviewed!)

[IgorTatarnikov]

LGMT 🎉. Thanks for addressing the comments!