chore: add Authenticator UI component not supported

Author: jjarvisp

src/pages/[platform]/build-a-backend/auth/concepts/multi-factor-authentication/index.mdx

@@ -858,8 +858,7 @@ In a scenario where MFA is marked as "Required" in the Cognito User Pool and ano
 ## Multi-factor authentication with EMAIL
 <InlineFilter filters={["react"]}>
 <Callout info>
-
-If you are using the [Authenticator component](https://ui.docs.amplify.aws/react/connected-components/authenticator) with Amplify, this feature works without any additional code. The guide below is for writing your own implementation.
+**Note:** Email-based MFA is currently not supported in the [Authenticator component](https://ui.docs.amplify.aws/react/connected-components/authenticator). We are working towards supporting this feature. For more information, visit the [feature request in GitHub](https://github.com/aws-amplify/amplify-ui/issues/5983).
 
 </Callout>
 </InlineFilter>