### 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 stat.S_ISREG(st.st_mode) and timestamp < st.st_mtime:
                        
                        out += 'File %s is newer, excluding file\n' % path
                        self.excludes.append(path)
                        continue
                else:
                    if timestamp != st.st_mtime:
                        change = True
                        self.includes.append(path)
                        err += 'File %s differs in mtime (%f vs %f)\n' % (path, timestamp, st.st_mtime)
                        itemized[4] = 't'
            
            if stat.S_ISREG(st.st_mode) and size != st.st_size:
                change = True
                err += 'File %s differs in size (%d vs %d)\n' % (path, size, st.st_size)
                itemized[3] = 's'
            
            if stat.S_ISREG(st.st_mode):
                crc = crc32(b_dest, self.io_buffer_size)
                if crc != self._crc32(path):
                    change = True
                    err += 'File %s differs in CRC32 checksum (0x%08x vs 0x%08x)\n' % (path, self._crc32(path), crc)
                    itemized[2] = 'c'
            
            
            if ftype != 'L':
                
                if self.file_args['mode']:
                    if isinstance(self.file_args['mode'], int):
                        mode = self.file_args['mode']