### Summary

Based on feedback from a mastodon ansible user:

The first example of https://docs.ansible.com/ansible/latest/collections/ansible/builtin/apt_key_module.html#examples (the apt_key replacement) shows how a pgp key is downloaded and declared as trusted for a repository, but there is no validation of the key going on. Maybe the get_url task could include the checksum argument, to show that (and how) the key should be validated against a known good. Further down there is also an example of apt_key downloading a key without the id argument specified.

### Issue Type

Documentation Report

### Component Name

apt_key

### Ansible Version

```console
$ ansible --version
2.15
```


### Configuration

```console
# if using a version older than ansible-core 2.12 you should omit the '-t all'
$ ansible-config dump --only-changed -t all
none
```


### OS / Environment

none

### Additional Information

The examples all use https URLs, so they do not expose you to just arbitrary MITM; but many projects use untrusted public mirrors to distribute packages and public keys, and instead post the fingerprint of the public key on the non-mirrored first-party website. You are then supposed to verify the downloaded key against that fingerprint (unfortunately a manual action since they post a PGP fingerprint and not a checksum), in order to protect against rogue mirror operators (AFAIK).

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
- gpg
seealso:
  - module: ansible.builtin.deb822_repository
options:
    id:
        description:
            - The identifier of the key.
            - Including this allows check mode to correctly report the changed state.
            - If specifying a subkey's id be aware that apt-key does not understand how to remove keys via a subkey id.  Specify the primary key's id instead.
            - This parameter is required when C(state) is set to C(absent).
        type: str
    data:
        description:
            - The keyfile contents to add to the keyring.
        type: str
    file:
        description:
            - The path to a keyfile on the remote server to add to the keyring.
        type: path
    keyring:
        description:
            - The full path to specific keyring file in C(/etc/apt/trusted.gpg.d/).
        type: path
        version_added: "1.3"
    url:
        description:
            - The URL to retrieve key from.
        type: str
    keyserver:
        description: