docs: fix typos #756

Job	Run time
docs	1m 22s
feature-checks	3m 5s
clippy	49s
doctest	1m 14s
fmt	14s
test stable (ubuntu-latest)	1m 7s
test stable --all-features (ubuntu-latest)	2m 20s
test 1.70 (ubuntu-latest)	37s
test stable (macos-latest)	1m 6s
test stable --all-features (macos-latest)	2m 22s
test 1.70 (macos-latest)	42s
test stable (windows-latest)	2m 56s
test stable --all-features (windows-latest)	4m 52s
test 1.70 (windows-latest)	2m 54s
	25m 40s

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