[Feedback] Guidance on how to add non-default Admin Actions

[nadetastic]

Page: /cli/auth/admin

Feedback:

When adding Admin Actions, several default admin actions are configured and made available, however some additional options that are exposed by Cognito (Admin*) are can also be added and some guidance on how to do so can be helpful.

An example of this at - aws-amplify/amplify-js#6704 (comment)

[nadetastic]

Closed by #5237