Why does Moodle Docs use MediaWiki rather than the Moodle wiki module?
MediaWiki was chosen for our documentation wiki because it is designed to be used by thousands of people collaboratively editing a large numbers of pages. It has lots of features, such as inter-language linking, templates, categories, namespaces and page redirects, which are put to good use in Moodle Docs. The wiki module is designed to be used within a Moodle course. Its features include nine different group options and the option to amend wiki permissions at course or activity level. It has far fewer tools than MediaWiki for handling large numbers of pages.