remove stale preview note

Author: ashwinder

articles/communication-services/how-tos/call-automation/teams-interop-call-automation.md

@@ -16,8 +16,6 @@ services: azure-communication-services
 
 # Add a Microsoft Teams user to an existing call using Call Automation
 
-[!INCLUDE [Public Preview Notice](../../includes/public-preview-include.md)]
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 In this quickstart, we use the Azure Communication Services Call Automation APIs to add, remove, and transfer call to a Teams user.
 
 ## Prerequisites