Disable `trimTrailingWhitespace` for md files #975

Job	Run time
spotlessCheck assemble testClasses	1m 42s
build (maven, 11, ubuntu-latest)	1m 4s
build (maven, 17, ubuntu-latest)	38s
build (gradle, 11, ubuntu-latest)	45s
build (gradle, 17, ubuntu-latest)	47s
build (maven, 11, windows-latest)	2m 31s
build (gradle, 17, windows-latest)	13m 11s
build (npm, 11, ubuntu-latest)	41s
	21m 19s

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