Adds bwi(4) at SEE ALSO section because some old devices aren't

supported by the bwn(4) firmware that as fas as I know the vendor
dropped its support.  Bumps date also.

share/man/man4/bwn.4

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 25, 2010
+.Dd September 6, 2010
 .Dt BWN 4
 .Os
 .Sh NAME
@@ -112,6 +112,7 @@ ifconfig wlan create wlandev bwn0 ssid my_net \e
 .Ed
 .Sh SEE ALSO
 .Xr arp 4 ,
+.Xr bwi 4 ,
 .Xr cardbus 4 ,
 .Xr intro 4 ,
 .Xr pci 4 ,