[bug #63812] Discussion of conditional expressions in docs should mention `.if h`

[John Gardner]

Follow-up Comment #3, bug #63812 (project groff):

[comment #2 comment #2:]
> That's documented because we _do_ support it.  If we didn't, the 'v' would
be treated as the opening delimiter of a formatted output comparison
operation, just like other letters that aren't conditional operators.
Ah right, that makes sense. Following that line of reasoning, then, it makes
sense _not_ to document `.if h` if Groff doesn't recognise it as a built-in
condition (and supporting it now would obviously break compatibility with
existing macros that, for whatever reason, use "h" as a string delimiter.


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