Notifications
Notifications have replaced Events in Umbraco 9+.
The documentation Notifications has been moved along with the rest of the documentation for newer versions of Umbraco: docs.umbraco.com.
You are currently looking at documentation for Umbraco 8 and older versions.
An automated guess is that docs.umbraco.com/umbraco-cms/reference/notifications/ could be the link to the new documentation for Umbraco 9 and newer versions.
Notifications have replaced Events in Umbraco 9+.
The documentation Notifications has been moved along with the rest of the documentation for newer versions of Umbraco: docs.umbraco.com.