[bug #58581] doc/groff.texi, man/groff_font.5.man: spacewidth value has incorrect units

[Dave]

Follow-up Comment #13, bug #58581 (project groff):

[comment #12 comment #12:]
> So actually the unit for spacewidth is correct, but its value is
> based on the prerequisite of type size having the value "unitwidth".

That definitely clarifies things, though I don't think the documentation made
this entirely clear, even if it was technically correct under that
prerequisite.

Commit 7ae6d67b
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=7ae6d67b> remedies this
and explains it quite clearly, I think.  I would say it resolves this bug,
though in its log message, Branden says he wants to expand the scope slightly
to include a related attribute.

The commit does have one very small punctuation issue.  This sentence is added
to both the Texinfo manual and to groff_font(5):

"groff achieves this using the system pioneered by AT&T device-independent
troff; one size of a font is chosen as a norm, and all other sizes are scaled
linearly relative to that basis."

However, the version in Texinfo is missing the semicolon, creating a run-on
sentence.  A minor quibble to a fine explanation.

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