Updated Google Group link

Author: jwngr

.github/CONTRIBUTING.md

@@ -20,7 +20,7 @@ which just ask about usage will be closed. Here are some resources to get help:
 - Try out some [examples](/README.md#examples)
 
 If the official documentation doesn't help, try asking a question on the
-[AngularFire Google Group](https://groups.google.com/forum/#!forum/firebase-angular) or one of our
+[Firebase Google Group](https://groups.google.com/forum/#!forum/firebase-talk) or one of our
 other [official support channels](https://firebase.google.com/support/).
 
 **Please avoid double posting across multiple channels!**

.github/ISSUE_TEMPLATE.md

@@ -14,7 +14,7 @@ will be closed. Here are some resources to get help:
 
 If the official documentation doesn't help, try asking through our official support channels:
 
-- AngularFire Google Group: https://groups.google.com/forum/#!forum/firebase-angular
+- Firebase Google Group: https://groups.google.com/forum/#!forum/firebase-talk
 - Other support channels: https://firebase.google.com/support/
 
 *Please avoid double posting across multiple channels!*

docs/guide/beyond-angularfire.md

@@ -76,7 +76,7 @@ There are many additional resources for learning about using Firebase with Angul
 * The [`angularfire-seed`](https://github.com/firebase/angularfire-seed) repo contains a template
 project to help you get started.
 * Check out the [various examples that use AngularFire](/README.md#examples).
-* Join our [AngularFire mailing list](https://groups.google.com/forum/#!forum/firebase-angular) to
+* Join our [Firebase mailing list](https://groups.google.com/forum/#!forum/firebase-talk) to
 keep up to date with any announcements and learn from the AngularFire community.
 * The [`angularfire` tag on Stack Overflow](http://stackoverflow.com/questions/tagged/angularfire)
 has answers to a lot of code-related questions.