Author: Sam Marshall
Roles MDL-23986 Added help to role archetype
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6397deaec8aac253ece926a11cc24769bd68c766
http://github.com/moodle/moodle/commit/6397deaec8aac253ece926a11cc24769bd68c766
+ 2.0 en [archetype_help,core_role]