### 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
elif uid and uid != fut_uid:
                change = True
                err += 'Path %s is owned by uid %s, not by uid %s as expected\n' % (path, uid, fut_uid)
                itemized[6] = 'o'
            
            group = gid = None
            try:
                group = grp.getgrgid(st.st_gid).gr_name
            except (KeyError, ValueError, OverflowError):
                gid = st.st_gid
            if run_uid != 0 and (fut_group != run_group or fut_gid != run_gid) and fut_gid not in groups:
                raise UnarchiveError('Cannot change group ownership of %s to %s, as user %s' % (path, fut_group, run_owner))
            if group and group != fut_group:
                change = True
                err += 'Path %s is owned by group %s, not by group %s as expected\n' % (path, group, fut_group)
                itemized[6] = 'g'
            elif gid and gid != fut_gid:
                change = True
                err += 'Path %s is owned by gid %s, not by gid %s as expected\n' % (path, gid, fut_gid)
                itemized[6] = 'g'
            
            if change:
                if path not in self.includes:
                    self.includes.append(path)
                diff += '%s %s\n' % (''.join(itemized), path)
        if self.includes:
            unarchived = False
        
        return dict(unarchived=unarchived, rc=rc, out=out, err=err, cmd=cmd, diff=diff)
    def unarchive(self):