Fix README link

Author: keerlu

firebase/notifications-example/README.md

@@ -58,5 +58,5 @@ To run this example project, you need:
 
 1. On the device where you want to receive push notifications, go to `https://<FIREBASE_APP_NAME>.web.app` and click the **Request token** button. Select to allow push notifications if prompted.
 1. Switch to a different tab with another site (this is so that a notification will trigger when you get a new message).
-1. Add a new message to the TalkJS `sample_conversation` conversation from the other user, `sample_user_alice`. A simple way to do this is to go to the **Chat UI** tab of the TalkJS dashboard](https://talkjs.com/dashboard) and add a message from the **Preview** chat UI.
+1. Add a new message to the TalkJS `sample_conversation` conversation from the other user, `sample_user_alice`. A simple way to do this is to go to the **Chat UI** tab of the [TalkJS dashboard](https://talkjs.com/dashboard) and add a message from the **Preview** chat UI.
 1. You should now receive a push notification to your device with the message text.