API Scheme: IAM deprecated warning, but documentation is not updated

### How did you install the Amplify CLI?

npm

### If applicable, what version of Node.js are you using?

_No response_

### Amplify CLI Version

12.7.1

### What operating system are you using?

windows

### Did you make any manual changes to the cloud resources managed by Amplify? Please describe the changes made.

Nope

### Describe the bug

When pushing amplify we get warning that our scheme is using IAM, but this is the method which is documented at amplify website.

`⚠️ WARNING: Schema is using an @auth directive with deprecated provider 'iam'. Replace 'iam' provider with 'identityPool' provider.`

You need to update documentation and `enum AuthProvider` at e.g. https://docs.amplify.aws/gen1/javascript/build-a-backend/graphqlapi/customize-authorization-rules/#how-it-works

### Expected behavior

Documentation should not use deprecated auth methods

### Reproduction steps

Make a scheme like the documentation suggest and push

### Project Identifier

_No response_

### Log output

```
# Put your logs below this line

```

### Additional information

_No response_

### Before submitting, please confirm:

- [X] I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.
- [X] I have removed any sensitive information from my code snippets and submission.