Author: Damyon Wiese
MDL-31276: Phpdocs cleanup for offline grading feature
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7a2b911c6baf15f074ce076f2fabccba2932ea56
http://github.com/moodle/moodle/commit/7a2b911c6baf15f074ce076f2fabccba2932ea56
+ 2.4 en [gradesfile_help,assignfeedback_offline]