Adds See Also sections to pandas.core.groupby.DataFrameGroupBy.sem, pandas.core.groupby.DataFrameGroupBy.nunique #20782

Job	Run time
Linux-32-bit	19m 14s
Linux-Musl	17m 15s
Pyodide build	25m 5s
python-dev (macOS-13)	18m 29s
python-dev (macOS-14)	12m 1s
python-dev (ubuntu-22.04)	20m 42s
python-dev (windows-latest)	24m 24s
python-freethreading	23m 57s
macos-13 actions-310.yaml	33m 41s
macos-13 actions-311.yaml	33m 55s
macos-13 actions-312.yaml	43m 0s
macos-14 actions-310.yaml	30m 22s
macos-14 actions-311.yaml	30m 1s
macos-14 actions-312.yaml	28m 41s
windows-latest actions-311.yaml	34m 30s
windows-latest actions-312.yaml	43m 53s
windows-latest actions-310.yaml	33m 44s
Minimum Versions	23m 12s
ubuntu-latest actions-310.yaml	44m 13s
ubuntu-latest actions-311.yaml	41m 11s
Future infer strings (without pyarrow)	37m 48s
Locale: zh_CN	22m 45s
Locale: it_IT	22m 53s
Downstream Compat	5m 24s
Numpy Dev	16m 40s
Pyarrow Nightly	19m 11s
ubuntu-latest actions-312.yaml	47m 21s
Future infer strings	48m 16s
Pypy	1m 26s
	13h 23m 14s

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