[bug #64440] [docs] minor corrections and updates

[Dave]

Follow-up Comment #3, bug #64440 (project groff):

[comment #1 comment #1:]
> The excitement's not done here.  The unit _is_ twelfths of an em after all!
> 
> ...for _nroff_ mode devices.

I confess I don't understand what distinction you're drawing here.  "1/12 of
the current space width" and "1/12 of an em" (and "1/12 of an en," for that
matter) work out to the same quantity in nroff.


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