Input: docs - split input docs into kernel- and user-facing

Split input documentation into several groups: kernel- and user-facing, and
notes about individual device drivers. Move device drivers docs into a
separate subdirectory.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/Documentation/input/input-programming.rst b/Documentation/input/input-programming.rst
index 4d3b222..57dbab6 100644
--- a/Documentation/input/input-programming.rst
+++ b/Documentation/input/input-programming.rst
@@ -1,7 +1,4 @@
-~~~~~~~~~~~~~~~~~~~~~~~~~
-Programming input drivers
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
+===============================
 Creating an input device driver
 ===============================