[bug #61998] doc/groff.texi: update Roman numeral info

[G. Branden Robinson]

Update of bug #61998 (project groff):

                  Status:                    None => Confirmed              

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Follow-up Comment #1:

Hi, Dave!

[comment #0 original submission:]

[snip]

Well, _I'm_ convinced...

> I think the points worth mentioning in the .af section of the manual are:
> 
>  * there is no standard representation of Roman numerals above 3,999;
>  * nonetheless, troff's use of W for 5,000 and Z for 10,000 is an aberration
with no historical precedent, and no modern use outside of troff's
descendants; and
>  * following Unicode's own recommendation, groff outputs Roman numerals
using only plain-ASCII characters, not any Roman numeral characters from
Unicode's Number Forms block.
> 
> With the above, there is no particular need to single out U+2181 and
U+2182.
> 
> If others agree with my reasoning, I'll write up some specific text to cover
these points.
> 
> No parallel change need be made in man/groff.7.man
<http://git.savannah.gnu.org/cgit/groff.git/tree/man/groff.7.man>, as this man
page gives no detail about how groff renders Roman numerals (nor did CSTR #54
before it).

Agreed.  Please supply a patch at your leisure.

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