update example with supported scope and adds link

Author: ykethan

src/pages/[platform]/build-a-backend/auth/concepts/external-identity-providers/index.mdx

@@ -216,6 +216,8 @@ You need to now inform your external provider of the newly configured authentica
 </Block>
 </BlockSwitcher>
 
+- [Learn more about using social identity providers with user pool](https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-social-idp.html)
+
 ### Customizing scopes for retrieving user data from external providers
 
 You can determine the pieces of data you want to retrieve from each external provider when setting them up in the `amplify/auth/resource.ts` file using `scopes`.
@@ -230,7 +232,7 @@ export const auth = defineAuth({
         clientId: secret('LOGINWITHAMAZON_CLIENT_ID'),
         clientSecret: secret('LOGINWITHAMAZON_CLIENT_SECRET'),
         // highlight-next-line
-        scopes: ['email']
+        scopes: ['profile']
       },
       callbackUrls: [
         'http://localhost:3000/profile',