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

* Qualify claim that text lines produce output--they don't (right away)
  if they're diverted.
* Fix copy-and-paste goof in description of `rj` request.
* Use Texinfo @key command to mark keyboard control character input.
* Refer to enablement _status_ as a Boolean value.
* Prefer "non-positive" over "nonpositive".
* Use Texinfo @: command after prose colons, for consistency with the
  rest of this document.
* Drop unnecessary commas.
* Drop empty requests in an example where we desperately need the vees.
* Use active voice more, and otherwise tighten wording to buy vees and
  improve page layout.

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