Merge pull request #553 from rust-lang/docs #272

Job	Run time
test (ubuntu-latest, 28.2)	52s
test (ubuntu-latest, 29.1)	44s
test (ubuntu-latest, 29.2)	52s
test (ubuntu-latest, 29.3)	1m 11s
test (macos-latest, 28.2)	2m 15s
test (macos-latest, 29.1)	2m 9s
test (macos-latest, 29.2)	2m 30s
test (macos-latest, 29.3)	2m 21s
test (windows-latest, 28.2)	1m 45s
test (windows-latest, 29.1)	2m 37s
test (windows-latest, 29.2)	2m 19s
test (windows-latest, 29.3)	1m 31s
test (ubuntu-latest, snapshot, true)	51s
test (macos-latest, snapshot, true)	2m 13s
	24m 10s

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