docs: fix grammar and spelling in Markdown #140

Job	Run time
build_all_features	5m 11s
build_all_platforms (ubuntu-latest)	2m 14s
build_all_platforms (macos-latest)	5m 19s
build_all_platforms (windows-latest)	5m 37s
build_default_features (ubuntu-latest)	1m 1s
build_under_wasm	49s
build_default_features (macos-latest)	3m 17s
build_default_features (windows-latest)	3m 1s
check_clippy	4m 1s
check_docs	3m 7s
check_msrv	3m 53s
unit	3m 14s
	40m 44s

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