[bug #63366] groff.texi: clarify handling of special fonts

[Dave]

Follow-up Comment #3, bug #63366 (project groff):

[comment #1 comment #1:]
> Now, why this vector of special fonts isn't reported as the
> global_special_fonts list, I don't know.  I'm not certain
> they're _supposed_ to be the same thing.

I'm not either, hence filing this as a documentation bug under the assumption
that the code is working right, just not explained well.  (Pre-groff behavior
can illuminate only so much, since troff historically lacked a .special
request.  CSTR #54 does speak of "one or more special fonts," suggesting there
was some mechanism for adding them; perhaps this was a hardware operation.)

Since learning that special fonts are irrelevant to the issue I was trying to
understand in bug #63354, my desire to poke more at this now has dwindled, but
I'll let the bug report linger until you work your way down to this part of
the docs.


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