Clean up markdown-link-check warnings (#1395) #2378

Job	Run time
build (ubuntu-latest, Debug)	6m 56s
build (macos-latest, Release)	8m 58s
build (ubuntu-latest, Release)	7m 2s
build (macos-latest, Debug)	5m 44s
build (windows-latest, Release)	13m 37s
build (windows-latest, Debug)	11m 40s
publish-coverage / publish-coverage	58s
	54m 55s

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