miscellaneous doxygen warnings

miscellaneous doxygen warnings

* @licence -> @license
* Protects inline HTML by using double quotes, our inline comments uses
  elements such as <h1> or <firstnameLastname@gmail.com>
* Commands in lowercase (@TODO -> @todo, @NOTE -> @note)
* removes @abstract and @static since doxygen detects them from PHP
  code.
* various undocumented function parameters
* typos in parameters declarations

Change-Id: I62ad6fc124c355bf31acc780b9614a59cf79a421