Update some release version numbers. The patch is based on the one

from the PR, but the version numbers reflect the newer ones from
http://security.freebsd.org/#sup

PR:             docs/145227
Submitted by:   Glen Barber (glen dot j dot barber at gmail dot com)
Reviewed by:    cperciva
Mentored by:    jkois
MFC after:      1 week

usr.sbin/freebsd-update/freebsd-update.8

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 11, 2007
+.Dd July 14, 2010
 .Dt FREEBSD-UPDATE 8
 .Os FreeBSD
 .Sh NAME
@@ -54,13 +54,13 @@ by the
 .Fx
 Release Engineering Team, e.g.,
 .Fx
-6.1-RELEASE and
+7.3-RELEASE and
 .Fx
-6.2-RC1, but not
+8.0, but not
 .Fx
-6.2-STABLE or
+6.3-STABLE or
 .Fx
-7.0-CURRENT.
+9.0-CURRENT.
 .Sh OPTIONS
 The following options are supported
 .Bl -tag -width "-f conffile"