doc: remove *.h so documentation generation doesn't complain

With *.h added, the REST processor does not escape it and it thinks is
a non-finished emphasis line (*ddd*). Although the rest generator
should be fixed to escape those things, we don't have the resources to
tackle that and removing '*.h' doesn't alter the meaning.

Change-Id: I6b39551fc8d37d8dd63a68ed70619fc8fb64f2e5
Signed-off-by: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>