Similar to MediaWikiHook, ExtensionHook should be able to display the hook interface when that uses the new hook system.
Example:
https://www.mediawiki.org/wiki/Manual:Hooks/UserLogout links to UserLogoutHook.php documentation. https://www.mediawiki.org/wiki/Extension:Renameuser/Hooks/RenameUserAbort should be able to do at least indicate https://github.com/wikimedia/mediawiki-extensions-Renameuser/blob/master/includes/Hook/RenameUserAbortHook.php exists.