Check documentation on CI #1344

Job	Run time
compute_package_version	8s
build_and_test (ubuntu-latest, Release, roslyn3.8)	3m 8s
check_documentation	34s
build_and_test (ubuntu-latest, Release, roslyn4.2)	3m 3s
build_and_test (ubuntu-latest, Release, roslyn4.4)	3m 7s
build_and_test (ubuntu-latest, Release, roslyn4.6)	3m 14s
build_and_test (ubuntu-latest, Release, roslyn4.8)	3m 7s
build_and_test (ubuntu-latest, Release, default)	2m 56s
build_and_test (windows-latest, Release, roslyn3.8)	7m 1s
build_and_test (windows-latest, Release, roslyn4.2)	6m 58s
build_and_test (windows-latest, Release, roslyn4.4)	8m 9s
build_and_test (windows-latest, Release, roslyn4.6)	8m 4s
build_and_test (windows-latest, Release, roslyn4.8)	7m 28s
build_and_test (windows-latest, Release, default)	6m 28s
create_nuget	2m 22s
validate_nuget	43s
deploy	29s
create_release	0s
	1h 6m 59s

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