doc: update tasks, update verbiage, and add to help doc

web-push.md

@@ -400,3 +400,22 @@ While notifications are turned on, the user can tap on the App Notifications tog
   * Active. (User can change to Muted when the user mutes notifications.)
   * Muted. (User can change to Active when the user toggles it.)
     (Turning mute off automatically after some amount of time is not planned in version 1.)
+
+
+# TROUBLESHOOTING
+
+## Desktop
+
+#### Firefox
+
+Go to `about:debugging` and click on `Inspect` for the service worker.
+
+#### Chrome
+
+Go to `chrome://inspect/#service-workers` and click on `Inspect` for the service worker.
+
+## Mobile
+
+#### Android
+
+#### iOS