### Summary

The documentation on https://docs.ansible.com/ansible/latest/collections/ansible/builtin/unarchive_module.html states that the module fully supports check-mode.
But the fact is that check-mode is not supported when it concerns a gzipped tar file cfr. https://github.com/ansible/ansible-modules-core/blob/00911a75ad6635834b6d28eef41f197b2f73c381/files/unarchive.py#L591
I was mislead by the '_fully_ supported' and noticed that the step was skipped in check-mode.
Wouldn't it make sense to adapt the documentation accordingly ?


### Issue Type

Documentation Report

### Component Name

https://github.com/ansible/ansible-modules-core/blob/00911a75ad6635834b6d28eef41f197b2f73c381/files/unarchive.py

### Ansible Version

```console
$ ansible --version
ansible [core 2.12.6]
  config file = ansible.cfg
  configured module search path = ['/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/dist-packages/ansible
  ansible collection location = /home/<user>/.ansible
  executable location = /usr/local/bin/ansible
  python version = 3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]
  jinja version = 2.11.3
  libyaml = True
```


### 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
```


### OS / Environment

Debian 11

### Additional Information

When the documentation is adapted, it is clear for everyone that unarchiving gzipped tar files is not check_mode compatible.

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
unarchived = True
        old_out = out
        out = ''
        run_uid = os.getuid()
        
        
        
        for line in old_out.splitlines() + err.splitlines():
            
            
            if EMPTY_FILE_RE.search(line):
                continue
            if run_uid == 0 and not self.file_args['owner'] and OWNER_DIFF_RE.search(line):
                out += line + '\n'
            if run_uid == 0 and not self.file_args['group'] and GROUP_DIFF_RE.search(line):
                out += line + '\n'
            if not self.file_args['mode'] and MODE_DIFF_RE.search(line):
                out += line + '\n'
            if MOD_TIME_DIFF_RE.search(line):
                out += line + '\n'
            if MISSING_FILE_RE.search(line):
                out += line + '\n'
            if INVALID_OWNER_RE.search(line):
                out += line + '\n'
            if INVALID_GROUP_RE.search(line):
                out += line + '\n'
        if out:
            unarchived = False
        return dict(unarchived=unarchived, rc=rc, out=out, err=err, cmd=cmd)
    def unarchive(self):