### 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
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.common.respawn import has_respawned, probe_interpreters_for_module, respawn_module
from ansible.module_utils._text import to_native
from ansible.module_utils.six import PY3
from ansible.module_utils.urls import fetch_url
try:
    import apt
    import apt_pkg
    import aptsources.distro as aptsources_distro
    distro = aptsources_distro.get_distro()
    HAVE_PYTHON_APT = True
except ImportError:
    apt = apt_pkg = aptsources_distro = distro = None
    HAVE_PYTHON_APT = False
APT_KEY_DIRS = ['/etc/apt/keyrings', '/etc/apt/trusted.gpg.d', '/usr/share/keyrings']
DEFAULT_SOURCES_PERM = 0o0644
VALID_SOURCE_TYPES = ('deb', 'deb-src')
def install_python_apt(module, apt_pkg_name):
    if not module.check_mode:
        apt_get_path = module.get_bin_path('apt-get')
        if apt_get_path:
            rc, so, se = module.run_command([apt_get_path, 'update'])
            if rc != 0:
                module.fail_json(msg="Failed to auto-install %s. Error was: '%s'" % (apt_pkg_name, se.strip()))
            rc, so, se = module.run_command([apt_get_path, 'install', apt_pkg_name, '-y', '-q'])
            if rc != 0:
                module.fail_json(msg="Failed to auto-install %s. Error was: '%s'" % (apt_pkg_name, se.strip()))
    else:
        module.fail_json(msg="%s must be installed to use check mode" % apt_pkg_name)
class InvalidSource(Exception):