Doc: DocBook: Fix a typo in device-drivers.tmpl

This patch fix a spelling typo in device-drivers.tmpl.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/DocBook/device-drivers.tmpl

@@ -368,7 +368,7 @@ X!Ilib/fonts/fonts.c
 !Iinclude/linux/input-polldev.h
 !Edrivers/input/input-polldev.c
      </sect1>
-     <sect1><title>Matrix keyboars/keypads</title>
+     <sect1><title>Matrix keyboards/keypads</title>
 !Iinclude/linux/input/matrix_keypad.h
      </sect1>
      <sect1><title>Sparse keymap support</title>