[bug #64494] explain practical usage of 'm' and 'n' scaling units better

[G. Branden Robinson]

Update of bug #64494 (project groff):

                  Status:                    None => Confirmed              
             Assigned to:                    None => gbranden               
                 Summary: [PATCH] groff_mdoc(7): units 'm' and 'n' are named
after  the upper case letters => explain practical usage of 'm' and 'n'
scaling units better

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Follow-up Comment #1:

Dropping patch annotation; I am rejecting this patch because the underlying
language is not strictly correct.

_groff_(7):

    m   Em; an em is equal to the current type size in points.
    n   En; an en is one‐half em.


However it does behoove us to explain to _mdoc_(7) man page authors what these
units mean, more along the lines of how they're explained above (the same
language appears in "groff.texi").

I also see the opportunity to explain a usage distinction between ems and ens,
namely to answer the question of why we have both when could "just" multiply
by 2 or ½, depending, and ensure that this explanation occurs where
necessary.

Retitling.


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  <https://savannah.gnu.org/bugs/?64494>

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