[Issue 17697] Ddoc: get rid of `_` detection in URLs

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17697

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to Adam D. Ruppe from comment #1)
> The correct solution is to get rid of the utterly counterproductive
> identifier highlighting entirely, then remove the useless _ suppression
> entirely.

We only need to restrict it to $(D ...) or `backtick` blocks, as any
identifiers that would benefit from being highlighted would need to be there
anyway.

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