added link to supplemental terms of use

Author: spelluru

articles/event-hubs/use-blob-storage-checkpoint-store-azure-stack-hub.md

@@ -20,8 +20,10 @@ If you're using Azure Blob Storage as the checkpoint store in an environment tha
 - [JavaScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.js) or  [TypeScript](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/eventhubs-checkpointstore-blob/samples/receiveEventsWithDownleveledStorage.ts), 
 - Python - [Synchronous](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/eventhub/azure-eventhub-checkpointstoreblob/samples/event_processor_blob_storage_example_with_storage_api_version.py), [Asynchronous](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/eventhub/azure-eventhub-checkpointstoreblob-aio/samples/event_processor_blob_storage_example_with_storage_api_version.py)
 
-> [!NOTE]
+> [!IMPORTANT]
 > Event Hubs on Azure Stack Hub is currently in preview. 
+> 
+> This public preview is provided without a service-level agreement and shouldn't be used for production workloads. Certain features might not be supported, might have constrained capabilities, or might not be available in all Azure locations. For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).
 
 If you run Event Hubs receiver that uses Blob Storage as the checkpoint store without targeting the version that Azure Stack Hub supports, you'll receive the following error message: