user docs: Add test-mobile-notifications.

docs/production/mobile-push-notifications.md

@@ -41,7 +41,7 @@ Congratulations!  You've successfully setup the service.
 If you'd like to verify that everything is working, you can do the
 following.  Please follow the instructions carefully:
 
-* [Configure mobile push notifications to always be sent][notification-settings]
+* [Configure mobile push notifications to always be sent][mobile-notifications-always]
   (normally they're only sent if you're idle, which isn't ideal for
   this sort of testing).
 * On an Android device, download and login to the
@@ -55,7 +55,7 @@ Zulip only sends push notifications for private messages sent by other
 users and messages mentioning you).  A push notification should appear
 in the Android notification area.
 
-[notification-settings]: https://zulipchat.com/help/configure-mobile-notifications
+[mobile-notifications-always]: https://zulipchat.com/help/test-mobile-notifications
 
 ## Updating your server's registration
 

templates/zerver/help/include/sidebar_index.md

@@ -75,6 +75,7 @@
 * [Alert words](/help/add-an-alert-word)
 * [Notify everyone on a stream](/help/notify-everyone-on-a-stream)
 * [Troubleshoot desktop notifications](/help/troubleshooting-desktop-notifications)
+* [Test mobile notifications](/help/test-mobile-notifications)
 
 ## Tools & customization
 * [Bots and integrations](/help/bots-and-integrations)

templates/zerver/help/test-mobile-notifications.md

@@ -0,0 +1,15 @@
+# Test mobile notifications
+
+Normally, mobile notifications are only sent if you're idle, which isn't
+ideal for testing.
+
+You can instead have mobile notifications sent for all private messages,
+regardless of whether you're on-line.
+
+{settings_tab|notifications}
+
+1. Under **Private messages and @-mentions**, enable
+   **Mobile notifications when offline**.
+
+1. Under **Private messages and @-mentions**, enable
+   **Mobile notifications always**.