There is a link on Special:Recent changes, linking to https://meta.wikimedia.org/wiki/Special:MyLanguage/Help:Recent_changes.
Changes provided by the Beta feature will not be documented on that page linked. A new icon dedicated to that Beta Feature is needed. It will link to the Help page that will be created on mw.org (T146669).
Assigned to Pau, to define the best place on the page.