Update managed-identity.md

Author: johndowns

articles/frontdoor/managed-identity.md

@@ -14,7 +14,7 @@ ms.author: duau
 Azure Front Door also supports using managed identities to access Key Vault certificate. A managed identity generated by Azure Active Directory (Azure AD) allows your Azure Front Door instance to easily and securely access other Azure AD-protected resources, such as Azure Key Vault. Azure manages this identity, so you don't have to create or rotate any secrets. For more information about managed identities, see [What are managed identities for Azure resources?](../active-directory/managed-identities-azure-resources/overview.md).
 
 > [!IMPORTANT]
-> Migration identity for Azure Front Door is currently in PREVIEW.
+> Managed identity for Azure Front Door is currently in PREVIEW.
 > See the [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/) for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.
 
 > [!NOTE]