### 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
type: bool
    default: no
    version_added: "2.2"
  validate_certs:
    description:
      - This only applies if using a https URL as the source of the file.
      - This should only set to C(no) used on personally controlled sites using self-signed certificate.
      - Prior to 2.2 the code worked as if this was set to C(yes).
    type: bool
    default: yes
    version_added: "2.2"
extends_documentation_fragment:
- action_common_attributes
- action_common_attributes.flow
- action_common_attributes.files
- decrypt
- files
attributes:
    action:
      support: full
    async:
      support: none
    bypass_host_loop:
      support: none
    check_mode:
      support: full
    diff_mode:
      support: partial
      details: Uses gtar's C(--diff) arg to calculate if changed or not. If this C(arg) is not supported, it will always unpack the archive.
    platform: