bug#14804: Gnus spelling fix: unexist -> nonexistent

[Jambunathan K]

Juanma Barranquero <lekktu@gmail.com> writes:

> This conversation is bringing back fond memories of my changing colour
> to color and behaviour to behavior, and Stefan's deadpan comment
> (archived in DEVEL.HUMOR)
>
> " [...] As is well known, people who speak American English tend to be
> more resource-conscious and try to avoid wasting precious bits
> transferring those redundant "u"s. Think of the number of occurrences
> of "color" and "behavior" in the Emacs tarball, multiply that by the
> number of times it'll be downloaded, stored on hard disks, archived,
> ...that's a substantial saving."

I think Stefan meant "people who write American English".
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