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<!--- Also test if the latest release and devel branch are affected too -->
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##### SUMMARY
<!--- Explain the problem briefly below, add suggestions to wording or structure -->
group module return values are undocumented.
<!--- HINT: Did you know the documentation has an "Edit on GitHub" link on every page ? -->

##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
<!--- Write the short name of the rst file, module, plugin, task or feature below, use your best guess if unsure -->
group
##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.9.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/aschultz/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 3.7.3 (default, Apr 09 2019, 05:18:21) [GCC]
```
if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = group.group_del()
            if rc != 0:
                module.fail_json(name=group.name, msg=err)
    elif group.state == 'present':
        if not group.group_exists():
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = group.group_add(gid=group.gid, system=group.system)
        else:
            (rc, out, err) = group.group_mod(gid=group.gid)
        if rc is not None and rc != 0:
            module.fail_json(name=group.name, msg=err)
    if rc is None:
        result['changed'] = False
    else:
        result['changed'] = True
    if out:
        result['stdout'] = out
    if err:
        result['stderr'] = err
    if group.group_exists():
        info = group.group_info()
        result['system'] = group.system
        result['gid'] = info[2]
    module.exit_json(**result)
if __name__ == '__main__':
    main()