net: x25: Fix dead URLs in Kconfig

Update the URLs in the Kconfig file to the new pages at sangoma.com and cisco.com
Signed-off-by: NMichael Drüing <michael@drueing.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/x25/Kconfig

@@ -16,8 +16,8 @@ config X25
 	  if you want that) and the lower level data link layer protocol LAPB
 	  (say Y to "LAPB Data Link Driver" below if you want that).
 
-	  You can read more about X.25 at <http://www.sangoma.com/x25.htm> and
-	  <http://www.cisco.com/univercd/cc/td/doc/product/software/ios11/cbook/cx25.htm>.
+	  You can read more about X.25 at <http://www.sangoma.com/tutorials/x25/> and
+	  <http://docwiki.cisco.com/wiki/X.25>.
 	  Information about X.25 for Linux is contained in the files
 	  <file:Documentation/networking/x25.txt> and
 	  <file:Documentation/networking/x25-iface.txt>.