More nat.conf(5) -> pf.conf(5) updates

src/etc/nat.conf

@@ -1,6 +1,6 @@
-#	$OpenBSD: nat.conf,v 1.4 2001/07/09 23:20:46 millert Exp $
+#	$OpenBSD: nat.conf,v 1.5 2002/06/16 18:55:50 miod Exp $
 #
-# See nat.conf(5) for syntax and examples
+# See pf.conf(5) for syntax and examples
 #
 # replace ext0 with external interface name, 10.0.0.0/8 with internal network
 # and 192.168.1.1 with external address