Remove obsolete email address from release documentation

Author: alcaeus

CONTRIBUTING.md

@@ -189,8 +189,7 @@ Thanks for our community contributors for this release:
  * [$CONTRIBUTOR_NAME](https://github.com/$GITHUB_USERNAME)
 ```
 
-Release announcements should also be sent to the `mongodb-user@googlegroups.com`
-and `mongodb-announce@googlegroups.com` mailing lists.
+Release announcements should also be sent to the [MongoDB Product & Driver Announcements](https://community.mongodb.com/tags/c/community/release-notes/35/php-driver).
 
 Consider announcing each release on Twitter. Significant releases should also be
 announced via [@MongoDB](http://twitter.com/mongodb) as well.