[bug #57618] man/groff_char.7.man: page needs an overhaul

[Dave]

Follow-up Comment #10, bug #57618 (project groff):

[comment #9 comment #9:]
> commit 1455bf9af0bd401bec52c4223dbf701152d96935
> Author: G. Branden Robinson <g.branden.robinson@gmail.com>
> Date:   Fri Oct 9 01:40:46 2020 +1100
> 
>     groff_char(7): Clarify NFD discussion.
>     
>     Clarify that GNU troff (the formatter) requires Unicode special
>     character escapes to be in Normalization Form D.  Give examples of 3
>     ways that work to input "café", and one that doesn't, using a
>     non-NFD-compliant Unicode special character escape.

But the example that doesn't work doesn't on a technicality.  It's true groff
doesn't recognize “caf\[u00e9]”, but it recognizes "caf\[u00E9]" just
fine.  And this is NFC form.  (And what preconv emits from Latin-1 input.) 
Groff just doesn't seem to be as NF-strict as this passage makes it out to be.

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