Use python rstcheck to validate syntax

Given that this repository contains multiple documents for
specifications is necessary to implement a mechanism to validate
its syntax. The rstchecker tool ensures that it meets the
reStructured Text guidelines.

Change-Id: I6a5d30c78718ae83265f9302f3d514eacaff2ae1
Issue-ID: DOC-300
Signed-off-by: Victor Morales <victor.morales@intel.com>