Author: Dongsheng Cai
MDL-22449, improve wiki help info
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6f1b029b6f07bc1ca9789425a678581ed4af3978
http://github.com/moodle/moodle/commit/6f1b029b6f07bc1ca9789425a678581ed4af3978
+ 2.0 en [editing,mod_wiki]
+ 2.0 en [editingpage,mod_wiki]