Fix typos (found by `typos` and `codespell`) and improve help text #11

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Run time

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Job	Run time
build (3.8, ubuntu-22.04)	15m 40s
build (3.9, ubuntu-22.04)	2m 12s
build (3.10, ubuntu-22.04)	2m 18s
build (3.11, ubuntu-22.04)	14m 51s
	35m 1s