Add references to lartc, also drop bogus reference to tc-filters

Patch from Debian iproute package.

diff -Nur old/man/man8/ip.8 new/man/man8/ip.8
--- old/man/man8/ip.8	2005-01-05 22:40:29.000000000 +0000
+++ new/man/man8/ip.8	2005-01-05 22:47:03.000000000 +0000
@@ -1803,6 +1803,8 @@
 .RB "IP Command reference " ip-cref.ps
 .br
 .RB "IP tunnels " ip-cref.ps
+.br
+.RB http://lartc.org/
 
 .SH AUTHOR
 
diff -Nur old/man/man8/tc.8 new/man/man8/tc.8
--- old/man/man8/tc.8	2004-10-19 20:49:02.000000000 +0000
+++ new/man/man8/tc.8	2005-01-05 22:46:15.000000000 +0000
@@ -341,7 +341,7 @@
 .BR tc-pfifo (8),
 .BR tc-bfifo (8),
 .BR tc-pfifo_fast (8),
-.BR tc-filters (8)
+.BR http://lartc.org/
 
 .SH AUTHOR
 Manpage maintained by bert hubert (ahu@ds9a.nl)