dev: rework markup boundary to fix list/enum/term item indent with comments #82

Job	Run time
Check minimum Rust version	18s
Check clippy, formatting, and documentation	15s
Duplicate Actions Detection	4s
Run tests	3m 12s
build (x86_64-unknown-linux-musl)	1m 54s
build (win32-x64)	2m 50s
build (win32-arm64)	3m 24s
build (linux-x64)	31s
build (linux-arm64)	1m 34s
build (linux-armhf)	1m 6s
build (darwin-x64)	47s
build (darwin-arm64)	51s
release	0s
	16m 46s

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