[clang] [Clang][Comments] Allow HTML tags across multiple lines (PR #120843)

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Nerixyz wrote:

> but I do wonder if this is a part of the compiler that could benefit from some fuzzing to help shake out parsing issues.

That's probably a good idea. I'm not sure how fuzzing works in Clang. At least having `-Wdocumentation` on while fuzzing would be good (assuming the fuzzer generates comments).

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One thing that's still missing from comment parsing is the ability to skip HTML comments (`<!-- ... -->`). I could make a followup PR for this.

https://github.com/llvm/llvm-project/pull/120843