This is a pretty common extension that lots of parties interact with. It's probably a good idea to get its documentation properly published.
Extension description and repo location: https://www.mediawiki.org/wiki/Special:MyLanguage/Extension:WikiEditor
Some documentation exists at:
https://www.mediawiki.org/wiki/Special:MyLanguage/Extension:WikiEditor/Toolbar_customization
https://www.mediawiki.org/wiki/Special:MyLanguage/Extension:WikiEditor/Toolbar_customization/Library
CodeMirror is an existing extension that has JSDoc that is being published.
https://gerrit.wikimedia.org/g/mediawiki/extensions/CodeMirror
Instructions for JSDoc are at:
https://www.mediawiki.org/wiki/JSDoc
This includes publishing instructions:
https://www.mediawiki.org/wiki/JSDoc#4._Publish_on_doc.wikimedia.org
After setting up publishing, it would then end up at https://doc.wikimedia.org in the MediaWiki Components section