aio_suspend.2: properly canonicalize .Dd

Months should be fully spelled as their local-specific equivalents: in this
case Oct should have been spelled like October.

Reported by: make manlint
MFC after: 1 week
Sponsored by: DellEMC Isilon

(cherry picked from commit 92d4164179518651ade878b87d5822db4e4dc355)