Author: Damyon Wiese
MDL-56782 custommenu - update docs
We don't support sub-menus in all themes (boost) so we want to update
the docs and example.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7e81bd114e77053a7857ab0a8869fe194cff1d2b
http://github.com/moodle/moodle/commit/7e81bd114e77053a7857ab0a8869fe194cff1d2b
+ 3.2 en [configcustommenuitems,core_admin]