[clang-tools-extra] [clang-doc] Replace HTML-CHECK commands with HTML-CHECK-NEXT commands (PR #181330)

[Paul Kirth via cfe-commits]

https://github.com/ilovepi commented:

This is much better. Probably one more pass over the check directives and this will be god to land.

https://github.com/llvm/llvm-project/pull/181330