fix: don't throw on comment in dtd #34

Job	Run time
build (12.x, ubuntu-latest, bash)	25s
build (12.x, macos-latest, bash)	9s
build (12.x, windows-latest, bash)	57s
build (12.x, windows-latest, powershell)	57s
build (14.x, ubuntu-latest, bash)	28s
build (14.x, macos-latest, bash)	6s
build (14.x, windows-latest, bash)	56s
build (14.x, windows-latest, powershell)	55s
build (16.x, ubuntu-latest, bash)	22s
build (16.x, macos-latest, bash)	19s
build (16.x, windows-latest, bash)	50s
build (16.x, windows-latest, powershell)	1m 7s
build (17.x, ubuntu-latest, bash)	24s
build (17.x, macos-latest, bash)	22s
build (17.x, windows-latest, bash)	59s
build (17.x, windows-latest, powershell)	58s
	10m 14s

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