add a comment about the comment in ttys about how to start xdm via init

src/etc/rc.local

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc.local,v 1.7 1996/09/21 07:23:55 deraadt Exp $
+#	$OpenBSD: rc.local,v 1.8 1997/01/01 20:14:03 graichen Exp $
 
 # site-specific startup actions, daemons
 # Add your local changes additions to this file
@@ -13,6 +13,11 @@ echo -n 'starting local daemons:'
 #	echo -n ' sshd';	/usr/local/sbin/sshd
 #fi
 
+#
+# you may also look at /etc/ttys on some architectures
+# (i386 for example) - there is an commented out example
+# how to start xdm via init 
+#
 #if [ -x /usr/X11R6/bin/xdm ]; then
 #	echo -n ' xdm';		/usr/X11R6/bin/xdm
 #fi