Input: include MT library as source for kerneldoc

Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
Signed-off-by: NHenrik Rydberg <rydberg@euromail.se>

Documentation/DocBook/device-drivers.tmpl

@@ -303,6 +303,10 @@ X!Idrivers/video/console/fonts.c
 !Edrivers/input/input.c
 !Edrivers/input/ff-core.c
 !Edrivers/input/ff-memless.c
+     </sect1>
+     <sect1><title>Multitouch Library</title>
+!Iinclude/linux/input/mt.h
+!Edrivers/input/input-mt.c
      </sect1>
      <sect1><title>Polled input devices</title>
 !Iinclude/linux/input-polldev.h