wiz 066e923046 Add EXIT STATUS section. From Ryan Kavanagh via jmc@openbsd.
Bump date. Remove unnecessary quotes.

XXX: The behaviour is now documented as-is, but it is weird.
"biff n; biff y" has an exit status of 1 because biff reports the
notification status when it was started, not after it has finished.
{Free,Open}BSD's biff behave the same, but it's unclear if it's intended
or a bug.
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