Update articles/container-apps/managed-identity.md

Author: anthonychu

articles/container-apps/managed-identity.md

@@ -319,7 +319,9 @@ To get a token for a resource, make an HTTP `GET` request to the endpoint, inclu
 
 ## <a name="scale-rules"></a>Use managed identity for scale rules
 
-Starting in API version `2024-02-02-preview`, you can use managed identities in your scale rules to authenticate with Azure services that support managed identities. To use a managed identity in your scale rule, use the `identity` property instead of the `auth` property in your scale rule. Acceptable values for the `identity` property are either the Azure resource ID of a user-assigned identity, or `system` to use a system-assigned identity.
+You can use managed identities in your scale rules to authenticate with Azure services that support managed identities. To use a managed identity in your scale rule, use the `identity` property instead of the `auth` property in your scale rule. Acceptable values for the `identity` property are either the Azure resource ID of a user-assigned identity, or `system` to use a system-assigned identity.
+
+> [!NOTE] Managed identity authentication in scale rules is in public preview. It's available in API version `2024-02-02-preview`.
 
 The following ARM template example shows how to use a managed identities with an Azure Queue Storage scale rule: