Disable `trimTrailingWhitespace` for md files (#1880) #991

Job	Run time
spotlessCheck assemble testClasses	1m 55s
build (maven, 11, ubuntu-latest)	28s
build (maven, 17, ubuntu-latest)	48s
build (gradle, 11, ubuntu-latest)	33s
build (gradle, 17, ubuntu-latest)	55s
build (maven, 11, windows-latest)	9s
build (gradle, 17, windows-latest)	2s
build (npm, 11, ubuntu-latest)	24s
	5m 14s

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