### 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
def __init__(self, src, b_dest, file_args, module):
        self.src = src
        self.b_dest = b_dest
        self.file_args = file_args
        self.opts = module.params['extra_opts']
        self.module = module
        if self.module.check_mode:
            self.module.exit_json(skipped=True, msg="remote module (%s) does not support check mode when using gtar" % self.module._name)
        self.excludes = [path.rstrip('/') for path in self.module.params['exclude']]
        self.include_files = self.module.params['include']
        self.cmd_path = None
        self.tar_type = None
        self.zipflag = '-z'
        self._files_in_archive = []
    def _get_tar_type(self):
        cmd = [self.cmd_path, '--version']
        (rc, out, err) = self.module.run_command(cmd)
        tar_type = None
        if out.startswith('bsdtar'):
            tar_type = 'bsd'
        elif out.startswith('tar') and 'GNU' in out:
            tar_type = 'gnu'
        return tar_type
    @property
    def files_in_archive(self):