Re: [groff] Regularize (sub)section cross references.

[Tadziu Hoffmann]

> "LOUD, SHOUTING HEADINGS" are ultimately a relic from
> the (tele)typewriter era.

It's just a technical limitation of teletypes that they
usually could not deal with different font sizes.  For the
actual printed manuals, the man macros traditionally had
the section headings printed one point size smaller, to
lessen that impression of "shouting".  This tells us that
the capitalization was intended as a presentational effect.
(But it's not clear why they did not attempt to achieve
this automatically with .tr.)