[bug #60665] groff.texi, groff_diff.7.man: clarify nroff adjustment algorithm differences

[G. Branden Robinson]

Follow-up Comment #5, bug #60665 (project groff):

I said in comment #1:

> I haven't gone to the trouble of trying to contrive a case where groff
> runs out of space to distribute in troff mode, but I suspect based
> upon the above that it can.  Maybe not, though.  Maybe troff devices
> always have a horizontal resolution greater than one-twelfth of an em,
> and that is the smallest amount of distributable inter-word space we
> can manipulate with the .ss request.

This isn't quite right.  In DWB 3.3 and groff, the units of the `ss` request
are twelfths of the `spacewidth` parameter of the font, not twelfths of an em.
 This is not a minor distinction, since as Dave recently pointed out, the
`spacewidth` generally ranges from 1/4th to 1/3rd of an em.


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