Fix some more documentation warnings for phpdoc - mantisforge.org/dev/phpdoc/errors.html
atm, all of events_api.php is defined as public functions.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@5721 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9