### 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
repo: deb http://archive.canonical.com/ubuntu hardy partner
    state: absent
- name: Add nginx stable repository from PPA and install its signing key on Ubuntu target
  ansible.builtin.apt_repository:
    repo: ppa:nginx/stable
- name: Add nginx stable repository from PPA and install its signing key on Debian target
  ansible.builtin.apt_repository:
    repo: 'ppa:nginx/stable'
    codename: trusty
- name: One way to avoid apt_key once it is removed from your distro
  block:
    - name: somerepo |no apt key
      ansible.builtin.get_url:
        url: https://download.example.com/linux/ubuntu/gpg
        dest: /etc/apt/trusted.gpg.d/somerepo.asc
    - name: somerepo | apt source
      ansible.builtin.apt_repository:
        repo: "deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/myrepo.asc] https://download.example.com/linux/ubuntu {{ ansible_distribution_release }} stable"
        state: present
'''
RETURN = '''#'''
import copy
import glob
import json
import os
import re
import sys
import tempfile
import random
import time