[PATCH] Remove duplicate file in Documentation/networking (drivers_net_wan_Kconfig)

wanpipe.txt and wan-router.txt in Documentation/networking contain the exact
same information (diff between the two shows no drivers/net/wan/Kconfig.
Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/net/wan/Kconfig

@@ -435,7 +435,7 @@ config VENDOR_SANGOMA
 	  the driver to support.
 
 	  If you have one or more of these cards, say M to this option;
-	  and read <file:Documentation/networking/wanpipe.txt>.
+	  and read <file:Documentation/networking/wan-router.txt>.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called wanpipe.