Minor team update to slack channel (#8235)

This minor edit changes the team slack channel to reflect what we have
currently.

content/departments/engineering/teams/source/support_rotation.md

@@ -11,7 +11,7 @@ It does _not_ mean that you are alone and should fix every issue completely and
 Here are the expectations when you are on support rotation:
 
 1. Triaging and resolving support requests is your #1 priority for the week. You can plan to do other work, but if a support request comes in or needs work, then that's the #1 priority.
-1. Monitor #discuss-source and #ask-engineering for Source-related questions and bug reports.
+1. Monitor #discuss-source and #discuss-engineering for Source-related questions and bug reports.
 1. Acknowledge bug reports and questions. Even a simple "I'm on it, taking a look" in the Slack thread is good, since it lets others on the team know that you are working on it.
 1. Provide the next engineering on support with the status of all in-flight issues before their rotation begins: prepare to report status of support in sprint planning.
 1. Ask for help when you are stuck! Don't spend too much time trying to troubleshoot an issue alone and you get stuck, especially if it's high priority. Do your best, ask the team, and resolve the issue.