kconfig: fix path to modules.txt in Kconfig help

Documentation/modules.txt doesn't exist, but
Documentation/kbuild/modules.txt does.

Signed-off-by: Alexander E. Patrakov
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/net/tipc/Kconfig b/net/tipc/Kconfig
index 3891cc0..f9e367d 100644
--- a/net/tipc/Kconfig
+++ b/net/tipc/Kconfig
@@ -18,7 +18,7 @@
 	  This protocol support is also available as a module ( = code which
 	  can be inserted in and removed from the running kernel whenever you
 	  want). The module will be called tipc. If you want to compile it
-	  as a module, say M here and read <file:Documentation/modules.txt>.
+	  as a module, say M here and read <file:Documentation/kbuild/modules.txt>.
 
 	  If in doubt, say N.