[media] doc-rst: Add cx88 documentation to media book

Convert the cx88 documentation to rst and add it to the v4l-devices
book
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/v4l-drivers/cx88.rst

+The cx88 driver
+===============
+
+.. note::
+
+   This documentation is outdated.
+
 cx8800 release notes
-====================
+--------------------
 
 This is a v4l2 device driver for the cx2388x chip.
 
 
 current status
-==============
+--------------
 
 video
 	- Basically works.
@@ -30,7 +37,7 @@ vbi
 
 
 how to add support for new cards
-================================
+--------------------------------
 
 The driver needs some config info for the TV cards.  This stuff is in
 cx88-cards.c.  If the driver doesn't work well you likely need a new
@@ -38,6 +45,8 @@ entry for your card in that file.  Check the kernel log (using dmesg)
 to see whenever the driver knows your card or not.  There is a line
 like this one:
 
+.. code-block:: none
+
 	cx8800[0]: subsystem: 0070:3400, board: Hauppauge WinTV \
 		34xxx models [card=1,autodetected]
 

Documentation/media/v4l-drivers/index.rst

@@ -23,4 +23,5 @@ License".
 	cafe_ccic
 	cpia2
 	cx18
+	cx88
 	zr364xx