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

[John Gardner]

Follow-up Comment #9, bug #63812 (project groff):

[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? Is its value treated like a whitespace-delimited
list (following the same rebarbative logic as Roff's argument
quoting/escaping), or is it closer to Awk and the Bourne shell in that an
(internal) field separator can be specified?

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

> > (This corresponds to PostScript's `where` operator, which locates the
entry on the dictionary stack which defines an entry with the given key. I'll
shut up now)
> By the time a request can process something in *roff, there aren't many
stacks of interest to look at.  Just a node list.
No no, I only mentioned that to elucidate my remark about "too many hours
coding in PostScript".


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