How to create the contents of the config directory (modules.yaml and api_specification)

### Summary

I would like to understand how the contents of the `config/` directory are created - I understand that they come via CloudFormations, but I was wondering whether they are automatically generated, or whether they are human generated and then ingested at build time? I've tried rebuilding the collection using Content Builder without the `api_specification` directory, and it only created a very limited number of modules. Can more details on how this directory is created/updated be included in the documentation please?

### Issue Type

Documentation Report

### Component Name

Content Builder configuraiton

### Ansible Version

```console (paste below)
$ ansible --version

```

### Collection Versions

```console (paste below)
$ ansible-galaxy collection list
```

### Configuration

```console (paste below)
$ ansible-config dump --only-changed

```

### OS / Environment

_No response_

### Additional Information

_No response_

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct

Start by reviewing the config/ directory, including modules.yaml and api_specification, and the existing Content Builder documentation. Trace how these contents are created or updated, then document whether they are generated or human-authored and how they affect collection rebuilding.

Written by the indexing model from the issue text.