Merge pull request #185374 from mrbullwinkle/mrb_01_18_2022_qna_preview

[Cognitive Services] [QnaMaker] Add Note indicating preview

Author: PRMerger6

articles/cognitive-services/QnAMaker/Tutorials/integrate-with-power-virtual-assistant-fallback-topic.md

@@ -10,6 +10,9 @@ ms.date: 11/09/2020
 # Tutorial: Add your knowledge base to Power Virtual Agents
 Create and extend a [Power Virtual Agents](https://powervirtualagents.microsoft.com/) bot to provide answers from your knowledge base.
 
+> [!NOTE]
+> The integration demonstrated in this tutorial is in preview and is not intended for deployment to production environments.
+
 In this tutorial, you learn how to:
 
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