docs: fix typos (#202) #757

Job	Run time
doctest	1m 21s
test stable (ubuntu-latest)	1m 18s
clippy	51s
test stable --all-features (ubuntu-latest)	2m 7s
test 1.70 (ubuntu-latest)	49s
docs	1m 17s
test stable (macos-latest)	1m 4s
feature-checks	3m 2s
test stable --all-features (macos-latest)	2m 37s
fmt	12s
test 1.70 (macos-latest)	41s
test stable (windows-latest)	3m 4s
test stable --all-features (windows-latest)	5m 0s
test 1.70 (windows-latest)	2m 55s
	26m 18s

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