Input: create a book with Linux Input documentation

Now that all files under Documentation/input follows the ReST markup
language, rename them to *.rst and create a book for the Linux Input
subsystem.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1b0a87f..092de1d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6488,7 +6488,7 @@
 M:	Henrik Rydberg <rydberg@bitmath.org>
 L:	linux-input@vger.kernel.org
 S:	Odd fixes
-F:	Documentation/input/multi-touch-protocol.txt
+F:	Documentation/input/multi-touch-protocol.rst
 F:	drivers/input/input-mt.c
 K:	\b(ABS|SYN)_MT_
 
@@ -13812,7 +13812,7 @@
 M:	Henk Vergonet <Henk.Vergonet@gmail.com>
 L:	usbb2k-api-dev@nongnu.org
 S:	Maintained
-F:	Documentation/input/yealink.txt
+F:	Documentation/input/yealink.rst
 F:	drivers/input/misc/yealink.*
 
 Z8530 DRIVER FOR AX.25