gropdf(1): Fix content, style, and markup nits.

Content:
* Introduce the concept of convenience macros earlier, then rely on it.
* Align terminology regarding page location traps with the rest of
  groff's documentation.
* Align header/footer terminology with the rest of groff's
  documentation.

Style:
* Tighten wording.
* Set macro call literals in bold.
* Use imperative voice more when describing device control commands.
* Present convenience macros _after_ full discussion of device control
  command behavior, not in the midst of it.
* Coalesce some single-sentence paragraphs into their predecessors.

Markup:
* Set file names in italics.
* Protect macro call literals from hyphenation.
* Use an empty request between sentences.
* Use two empty requests where vertical space is expected.

0 files changed, 0 insertions, 0 deletions