doc/groff.texi: Fix content and style nits.

* Drop what was a backward cross reference; the material now lives
  forward of this place, in section/node "Punning Names".  Since it's
  esoteric I don't think it needs a cross reference anymore.
* Use a less recursive example of wide vertical spacing.
* Supplementary inter-sentence spaces are not really removed from the
  ends of output lines because they don't exist in the first place.
  Correct cross reference to where trailing spaces on input lines are
  discussed.

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