[PATCH] minor fixes to Texinfo manual

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Hi groff developer(s),

I normally put documentation patches in a savannah ticket, since
they're usually not of interest to the general groff community, but
the changes proposed here are minor, and having a ticket triggers an
update to ChangeLog, which this change doesn't otherwise warrant.  So
I'm choosing to submit this patch to this list as the lowest-overhead
solution.

Changes included in the attached patch are:

    doc/groff.texi.in: Fix style nits.

    * Add commas before "and"s introducing independent clauses where
      the "and" might otherwise be temporarily misread as part of a
      compound predicate.
    * Use parentheses rather than dashes to set off a parenthetical
      after an item in a series: the dashes require omitting a comma,
      making it harder to parse the construction as a series.
    * Parallelize a series.
    * Fix a typo.

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