### Summary

The [`filename` parameter docs](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/apt_repository_module.html#parameter-filename) don't give enough info to tell how the file name is generated.

I believe my `repo: deb https://packagecloud.io/linz/prod/ubuntu/ {{ ansible_distribution_release }} main` is hanging indefinitely ~~, and I suspect this has something to do with the file name being a duplicate, resulting in a background prompt which is never printed or dismissed, but it's hard to tell based on the [code](https://github.com/ansible/ansible/blob/f3be331c9cb2f2c6edeb0bdf28a1e8a9681d727c/lib/ansible/modules/apt_repository.py#L235-L258)~~ (Based on copying the code into a Python interpreter it looks like the generated file name is `packagecloud_io_linz_prod_ubuntu.list`, which looks fine.).

### Issue Type

Documentation Report

### Component Name

lib/ansible/modules/apt_repository.py

### Ansible Version

```console
N/A
```


### Configuration

```console
N/A
```


### OS / Environment

N/A

### Additional Information

N/A

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
if line.startswith('ppa:'):
            source = self._expand_ppa(line)[0]
        else:
            source = self._parse(line, raise_if_invalid_or_disabled=True)[2]
        self._remove_valid_source(source)
    @property
    def repos_urls(self):
        _repositories = []
        for parsed_repos in self.files.values():
            for parsed_repo in parsed_repos:
                valid = parsed_repo[1]
                enabled = parsed_repo[2]
                source_line = parsed_repo[3]
                if not valid or not enabled:
                    continue
                if source_line.startswith('ppa:'):
                    source, ppa_owner, ppa_name = self._expand_ppa(source_line)
                    _repositories.append(source)
                else:
                    _repositories.append(source_line)
        return _repositories
def revert_sources_list(sources_before, sources_after, sourceslist_before):
    '''Revert the sourcelist files to their previous state.'''
    
    for filename in set(sources_after.keys()).difference(sources_before.keys()):
        if os.path.exists(filename):
            os.remove(filename)
    
    sourceslist_before.save()
def main():