Update to doc for AAS MI

Azure Analysis Services doesn't support AAD Managed Identities, so I updated the document to reflect this.

Author: ermereen

articles/analysis-services/analysis-services-service-principal.md

@@ -15,7 +15,7 @@ Service principals are an Azure Active Directory application resource you create
 
 In Analysis Services, service principals are used with Azure Automation, PowerShell unattended mode, custom client applications, and web apps to automate common tasks. For example, provisioning servers, deploying models, data refresh, scale up/down, and pause/resume can all be automated by using service principals. Permissions are assigned to service principals through role membership, much like regular Azure AD UPN accounts.
 
-Analysis Services also supports operations performed by managed identities using service principals. To learn more, see [Managed identities for Azure resources](../active-directory/managed-identities-azure-resources/overview.md) and [Azure services that support Azure AD authentication](../active-directory/managed-identities-azure-resources/services-support-managed-identities.md#azure-analysis-services).    
+Analysis Services does not support operations performed by managed identities using service principals. To learn more, see [Managed identities for Azure resources](../active-directory/managed-identities-azure-resources/overview.md) and [Azure services that support Azure AD authentication](../active-directory/managed-identities-azure-resources/services-support-managed-identities.md#azure-analysis-services).    
 
 ## Create service principals