Re: miss spell in `accept-process-output' doc string

[Richard Matthew Stallman]

    The "iff" idiom is sufficiently common that we don't want to shy away
    from it just at this one place.  So either we rule it out everywhere, or we
    use it liberally.

Now that I think about it, I realize that many Emacs users have not studied
the advanced mathematics where they would encounter the term "iff".
So I think it is better to avoid that term.

(I was the one who introduced it into Emacs doc strings.)