[bug #62973] introduce documentary concept: "unstyled" characters/glyphs

[G. Branden Robinson]

Follow-up Comment #1, bug #62973 (project groff):

> here were a few exceptions.  The plus, minus, and equals signs were
available in text fonts as well as the special font.  (The reason for this was
to reduce the number of font changes, a mechanical process with the C/A/T,
when typesetting equations.)

It would be better to phrase this a bit the other way around.

The plus, minus, and equals signs were available in the special font well
despite already being available in the text fonts.  (The reason for this was
to reduce the number of font changes, a mechanical process with the C/A/T,
when typesetting equations.)


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