### 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
if data is not None:
        if keyring:
            cmd = "%s --keyring %s add -" % (apt_key_bin, keyring)
        else:
            cmd = "%s add -" % apt_key_bin
        (rc, out, err) = module.run_command(cmd, data=data, binary_data=True)
        if rc != 0:
            module.fail_json(
                msg="Unable to add a key from binary data",
                cmd=cmd,
                rc=rc,
                stdout=out,
                stderr=err,
            )
    else:
        if keyring:
            cmd = "%s --keyring %s add %s" % (apt_key_bin, keyring, keyfile)
        else:
            cmd = "%s add %s" % (apt_key_bin, keyfile)
        (rc, out, err) = module.run_command(cmd)
        if rc != 0:
            module.fail_json(