fix: don't throw on comment in dtd #30

Job	Run time
build (12.x, ubuntu-latest, bash)	25s
build (12.x, macos-latest, bash)	5s
build (12.x, windows-latest, bash)	1m 18s
build (12.x, windows-latest, powershell)	51s
build (14.x, ubuntu-latest, bash)	29s
build (14.x, macos-latest, bash)	5s
build (14.x, windows-latest, bash)	1m 7s
build (14.x, windows-latest, powershell)	58s
build (16.x, ubuntu-latest, bash)	21s
build (16.x, macos-latest, bash)	20s
build (16.x, windows-latest, bash)	1m 1s
build (16.x, windows-latest, powershell)	53s
build (17.x, ubuntu-latest, bash)	24s
build (17.x, macos-latest, bash)	21s
build (17.x, windows-latest, bash)	45s
build (17.x, windows-latest, powershell)	45s
	10m 8s

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