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### What changes were proposed in this pull request? This PR adds few lines about docstring style to document that PySpark follows [NumPy documentation style](https://numpydoc.readthedocs.io/en/latest/format.html). We all completed the migration to NumPy documentation style at SPARK-32085. Ideally we should have a page like https://pandas.pydata.org/docs/development/contributing_docstring.html but I would like to leave it as a future work. ### Why are the changes needed? To tell developers that PySpark now follows NumPy documentation style. ### Does this PR introduce _any_ user-facing change? No, it's a change in unreleased branches yet. ### How was this patch tested? Manually tested via `make clean html` under `python/docs`:  Closes #30622 from HyukjinKwon/SPARK-33256. Authored-by: HyukjinKwon <gurwls223@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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| .. | ||
| _static | ||
| _templates/autosummary | ||
| development | ||
| getting_started | ||
| migration_guide | ||
| reference | ||
| user_guide | ||
| conf.py | ||
| index.rst | ||
