docs: fix typos #755

Job	Run time
clippy	51s
doctest	1m 17s
docs	1m 18s
feature-checks	3m 5s
fmt	16s
test stable (ubuntu-latest)	1m 4s
test stable --all-features (ubuntu-latest)	2m 8s
test 1.70 (ubuntu-latest)	38s
test stable (macos-latest)	1m 18s
test stable --all-features (macos-latest)	2m 48s
test 1.70 (macos-latest)	42s
test stable (windows-latest)	3m 33s
test stable --all-features (windows-latest)	4m 3s
test 1.70 (windows-latest)	3m 5s
	26m 6s

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