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

[G. Branden Robinson]

Follow-up Comment #10, bug #63812 (project groff):

[comment #9 comment #9:]
> [comment #8 comment #8:]
> > This would be a simple iterator.  The string named "s" takes on the value
of each item in string-expr from left to right.
> How is string-expr tokenised?

Sorry, I wasn't thinking properly when I typed that.  (Haven't actually tried
to implement this yet.)

The second argument would need to be a "name", so a string/macro/diversion. 
Attempting to iterate over an undefined one would probably throw a "mac"
warning.  Attempting to iterate over a request would be rejected with an
error.

> What do you mean by contrivance? AFAIK, most of the characters documented by
groff_char(7) have corresponding entries in the UCD.

I'm starting to remember what I wanted the really-a-glyph predicate for.

See bug #63354.  There's a lot to it.

> No no, I only mentioned that to elucidate my remark about "too many hours
coding in PostScript".

Ahhh.  No worries.  :)


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