Update documentation: Add Federated sign in (i.e. Google)

[ajaylamba-provar]

Does the app support federated sign using Google, Facebook etc? I can see that there is some code in app-configured.tsx file which is related to federated sign in but there are no options on the Sign In page.

I tried adding following and it did display the Sign In with Google option but it is not working correctly.
<Authenticator socialProviders={['google']}

I have configured the federated sign in in Cognito console manually where I have put Google ClientId and Client Secret values.

Seems like aws-exports.json is not having auth_federated_provider field and other such information.