DOC: DataFrameGroupBy.idxmin() returns DataFrame, documentation says Serie #20762

Job	Run time
Pyodide build	24m 46s
Linux-32-bit	19m 20s
Linux-Musl	16m 50s
macos-13 actions-310.yaml	26m 53s
macos-13 actions-311.yaml	28m 38s
macos-13 actions-312.yaml	29m 1s
macos-14 actions-310.yaml	21m 49s
macos-14 actions-312.yaml	19m 12s
macos-14 actions-311.yaml	14m 4s
windows-latest actions-311.yaml	28m 54s
windows-latest actions-312.yaml	28m 52s
windows-latest actions-310.yaml	28m 54s
python-dev (macOS-13)	28m 40s
python-dev (macOS-14)	12m 36s
python-dev (ubuntu-22.04)	20m 17s
python-dev (windows-latest)	23m 18s
python-freethreading	23m 7s
ubuntu-latest actions-310.yaml	28m 56s
Minimum Versions	23m 26s
ubuntu-latest actions-311.yaml	28m 54s
Future infer strings (without pyarrow)	28m 55s
Locale: zh_CN	22m 51s
Downstream Compat	5m 35s
Locale: it_IT	22m 54s
Numpy Dev	16m 6s
Pyarrow Nightly	19m 22s
ubuntu-latest actions-312.yaml	28m 55s
Future infer strings	33m 39s
Pypy	1m 18s
	10h 56m 2s

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