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[SPARK-50159][PYTHON][DOCS][TESTS] Refine docstrings for aggregation …
…functions - part 1 ### What changes were proposed in this pull request? Refine docstrings for aggregation functions - part 1 ### Why are the changes needed? 1, improve the documentation; 2, improve the doctest coverage; ### Does this PR introduce _any_ user-facing change? doc-only changes ### How was this patch tested? new doctests ### Was this patch authored or co-authored using generative AI tooling? no Closes apache#48694 from zhengruifeng/py_doc_3. Authored-by: Ruifeng Zheng <ruifengz@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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