Update the push notifications overview (#1151)

docusaurus/docs/Android/06-advanced/02-push-notifications/01-overview.mdx

@@ -5,6 +5,11 @@ title: Overview
 
 Push notifications can be configured to receive updates when the application is closed or on the background, or even app is in a different contextual screen. Stream Video Server sends push notification for Ringing calls and Live calls that are about to start to users that have at least one registered device.
 
+Push notifications are sent in the following scenarios:
+- you create a call with the `ring` value set to true. In this case, a notification that shows a ringing screen is sent.
+- you create a call with the `notify` value set to true. In this case, a regular push notification is sent.
+- you haven't answered a call. In this case, a missed call notification is sent (regular push notification).
+
 To receive push notifications from Stream Video Server, you'll need to:
 
 1. Configure your push notification provider on the [Stream Dashboard](https://dashboard.getstream.io/).