Remove ns(4) reference.

share/man/man4/lo.4

@@ -1,4 +1,4 @@
-.\"	$NetBSD: lo.4,v 1.9 2004/12/04 17:03:04 wiz Exp $
+.\"	$NetBSD: lo.4,v 1.10 2006/09/02 23:40:22 wiz Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)lo.4	8.1 (Berkeley) 6/5/93
 .\"
-.Dd December 4, 2004
+.Dd September 3, 2006
 .Dt LO 4
 .Os
 .Sh NAME
@@ -73,7 +73,6 @@ unsuitable address family; the packet was dropped.
 .Sh SEE ALSO
 .Xr inet 4 ,
 .Xr intro 4 ,
-.Xr ns 4 ,
 .Xr ifconfig 8
 .Sh HISTORY
 The