Some improvements, add missing point #723

Job	Run time
Documentation (stable)	40s
Documentation (beta)	43s
Format	8s
Validate external types appearing in public API	1m 19s
Documentation (nightly)	41s
Documentation (stable 7 months ago)	44s
Clippy	4m 42s
build-windows	7m 2s
build (macOS-latest, stable)	1m 5s
Measure coverage	36s
build (ubuntu-latest, stable)	5m 12s
Check semver compatibility	41s
build (ubuntu-latest, beta)	33s
build (ubuntu-latest, nightly)	5m 5s
build (ubuntu-latest, stable 7 months ago)	36s
	29m 47s

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