Apply suggestions from code review

Co-authored-by: josef <[email protected]>

Author: jjarvisp

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

@@ -55,7 +55,7 @@ export const auth = defineAuth({
 ```
 
 <Callout info>
-Email-based MFA is currently not supported with `defineAuth`. We are working towards supporting this feature. For more information, visit the [feature request in GitHub](https://github.com/aws-amplify/amplify-backend/issues/2159).
+**Note:** Email-based MFA is currently not supported with `defineAuth`. We are working towards supporting this feature. For more information, visit the [feature request in GitHub](https://github.com/aws-amplify/amplify-backend/issues/2159).
 
 To take advantage of this feature with an Amplify generated backend, the underlying CDK construct can be extended manually. See [overriding Cognito User Pool multi-factor authentication options](/[platform]/build-a-backend/auth/modify-resources-with-cdk/#override-cognito-userpool-multi-factor-authentication-options) for more information.
 </Callout>

src/pages/[platform]/build-a-backend/auth/modify-resources-with-cdk/index.mdx

@@ -89,10 +89,9 @@ export const auth = defineAuth({
   },
 })
 ```
-Next, extend the underlying CDK construct by activating Advanced Security Mode and adding `EMAIL_OTP` to the enabled MFA options.
+Next, extend the underlying CDK construct by activating [Amazon Cognito's Advanced Security Features (ASF)](https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pool-settings-advanced-security.html) and add `EMAIL_OTP` to the enabled MFA options.
 
 ```ts title="amplify/backend.ts"
-
 import { defineBackend } from "@aws-amplify/backend"
 import { auth } from "./auth/resource"