Update cdn-storage-custom-domain-https.md

The following should be clearly stated so readers are aware of the risks:

"Azure Content Delivery Network provides a permanent access to Azure Storage resources and removing the access requires manual steps."

Author: azarboon

articles/cdn/cdn-storage-custom-domain-https.md

@@ -14,6 +14,10 @@ ms.custom: mvc
 
 After you've integrated your Azure Storage account with Azure Content Delivery Network, you can add a custom domain and enable HTTPS on that domain for your custom blob storage endpoint.
 
+> [!NOTE]  
+> Azure Content Delivery Network provides a permanent access to Azure Storage resources and removing the access requires manual steps.
+> 
+
 ## Prerequisites
 
 Before you can complete the steps in this tutorial, you must first integrate your Azure Storage account with Azure Content Delivery Network. For more information, see [Quickstart: Integrate an Azure Storage account with Azure Content Delivery Network](cdn-create-a-storage-account-with-cdn.md).