[Docs] fix good_first_issue link to lead to datafusion-ballista project

docs/source/community/communication.md

@@ -75,7 +75,7 @@ We will send a summary of all sync ups to the [email protected] mailing
 Our source code is hosted on
 [GitHub](https://github.com/apache/arrow-datafusion). More information on contributing is in
 the [Contribution Guide](https://github.com/apache/arrow-datafusion/blob/master/CONTRIBUTING.md)
-, and we have curated a [good-first-issue](https://github.com/apache/arrow-datafusion/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
+, and we have curated a [good-first-issue](https://github.com/apache/datafusion-ballista/labels/good%20first%20issue)
 list to help you get started. You can find datafusion's major designs in docs/source/specification.
 
 We use GitHub issues for maintaining a queue of development work and as the