Add devd.conf(5) and devd(8) to SEE ALSO xrefs. Give users a pointer to

seemingly mysterious actions that are not done by ifconfig itself, but
by devd triggering on events caused by ifconfig.

PR:		docs/173405
Submitted by:	Mateusz Kwiatkowski <mateusz.kwiatkowski@atlashost.eu>
MFC after:	1 week

sbin/ifconfig/ifconfig.8

@@ -28,7 +28,7 @@
 .\"     From: @(#)ifconfig.8	8.3 (Berkeley) 1/5/94
 .\" $FreeBSD$
 .\"
-.Dd July 9, 2012
+.Dd November 7, 2012
 .Dt IFCONFIG 8
 .Os
 .Sh NAME
@@ -2714,7 +2714,9 @@ tried to alter an interface's configuration.
 .Xr pfsync 4 ,
 .Xr polling 4 ,
 .Xr vlan 4 ,
+.Xr devd.conf 5 ,
 .\" .Xr eon 5 ,
+.Xr devd 8 ,
 .Xr rc 8 ,
 .Xr routed 8 ,
 .Xr jail 8 ,