Input: db9/CD32 - convert documentation into ReST format

Currently, it misses a title, and the table is not valid for ReST. Adjust
them, in order for it to be able to parse on Sphinx.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>