Fix docstring groupby #20788

Job	Run time
Pyodide build	24m 55s
Linux-Musl	17m 23s
Linux-32-bit	19m 20s
python-freethreading	24m 27s
python-dev (macOS-14)	11m 37s
python-dev (macOS-13)	32m 18s
python-dev (ubuntu-22.04)	20m 35s
python-dev (windows-latest)	23m 45s
macos-13 actions-310.yaml	32m 57s
macos-13 actions-311.yaml	32m 25s
macos-13 actions-312.yaml	32m 29s
macos-14 actions-310.yaml	28m 38s
macos-14 actions-311.yaml	22m 58s
macos-14 actions-312.yaml	31m 54s
windows-latest actions-311.yaml	32m 17s
windows-latest actions-312.yaml	32m 17s
windows-latest actions-310.yaml	32m 17s
ubuntu-latest actions-310.yaml	32m 20s
Minimum Versions	23m 12s
ubuntu-latest actions-311.yaml	32m 19s
Locale: zh_CN	23m 9s
Future infer strings (without pyarrow)	32m 21s
Locale: it_IT	23m 18s
Downstream Compat	5m 40s
Numpy Dev	16m 55s
Pyarrow Nightly	19m 14s
ubuntu-latest actions-312.yaml	32m 19s
Future infer strings	32m 17s
Pypy	1m 13s
	12h 6m 49s

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