DOC: fix SA01, ES01 for pandas.Series.sparse.npoints #19325

Job	Run time
Linux-32-bit	19m 33s
Pyodide build	25m 1s
Linux-Musl	17m 16s
python-freethreading	24m 0s
macos-13 actions-311.yaml	2m 43s
macos-13 actions-310.yaml	3m 4s
macos-13 actions-312.yaml	3m 9s
macos-14 actions-310.yaml	1m 1s
macos-14 actions-312.yaml	53s
windows-latest actions-311.yaml	2m 46s
windows-latest actions-312.yaml	2m 42s
windows-latest actions-310.yaml	3m 1s
macos-14 actions-311.yaml	51s
python-dev (macOS-13)	38m 1s
python-dev (macOS-14)	20m 33s
python-dev (ubuntu-22.04)	24m 0s
python-dev (windows-latest)	28m 7s
ubuntu-latest actions-310.yaml	2m 57s
Minimum Versions	3m 15s
ubuntu-latest actions-311.yaml	2m 38s
Future infer strings (without pyarrow)	2m 55s
Locale: zh_CN	2m 46s
Locale: it_IT	2m 56s
Downstream Compat	1m 26s
Numpy Dev	1m 25s
Pyarrow Nightly	1m 12s
ubuntu-latest actions-312.yaml	2m 54s
Future infer strings	2m 51s
Pypy	1m 21s
	4h 5m 17s

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