Edit public API details for clarity, grammar, punctuation found
on file event_logger.h
Includes the event logger information in the ReST documentation.
Modifies doxygen.config to include the event logger.
Made consistent use of @retval to document return values.
Used imperative verbs for all @brief descriptions.
Change-Id: I88b8672a527138e2b4f7df4b4b0495a0d871cad3
Signed-off-by: Rodrigo Caballero <rodrigo.caballero.abraham@intel.com>