Checkstyle: enable javadoc checks `NonEmptyAtclauseDescription` and `AtclauseOrder` #4670

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Job	Run time
preliminary sanity checks	2m 22s
build (ubuntu-20.04, native)	15m 41s
build (ubuntu-20.04, nio)	15m 57s
build (macos-11, native)	23m 34s
build (macos-11, nio)	23m 24s
build (windows-2019, nio)	34m 8s
	1h 55m 6s