DOC: Fix typo in to_html and to_string docs #23688

Job	Run time
python-dev	0s
Linux-32-bit	18m 21s
Linux-Musl	15m 54s
macos-13 actions-312.yaml	30m 3s
macos-13 actions-311.yaml	25m 52s
macos-13 actions-313.yaml	31m 42s
macos-14 actions-310.yaml	29m 0s
macos-14 actions-312.yaml	34m 57s
macos-14 actions-313.yaml	35m 22s
windows-latest actions-312.yaml	37m 29s
macos-14 actions-311.yaml	19m 38s
windows-latest actions-310.yaml	33m 47s
windows-latest actions-311.yaml	36m 42s
ubuntu-24.04 actions-311.yaml	44m 34s
windows-latest actions-313.yaml	42m 22s
ubuntu-24.04 actions-312.yaml	43m 9s
Pyodide build	25m 54s
macos-13 actions-310.yaml	38m 29s
ubuntu-24.04-arm actions-310.yaml	37m 33s
Locale: it_IT	23m 33s
ubuntu-24.04-arm actions-311.yaml	34m 18s
Pypy	1m 20s
ubuntu-24.04 actions-313.yaml	48m 29s
Future infer strings (without pyarrow)	39m 42s
Freethreading	21m 10s
Downstream Compat	5m 18s
Pyarrow Nightly	20m 0s
Future infer strings	45m 7s
Numpy Dev	16m 52s
Minimum Versions	22m 59s
ubuntu-24.04 actions-310.yaml	46m 29s
ubuntu-24.04-arm actions-313.yaml	35m 14s
ubuntu-24.04-arm actions-312.yaml	35m 41s
Locale: zh_CN	23m 18s
	16h 40m 18s

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