##### SUMMARY
If a module sets `add_file_common_args=True` when calling `AnsibleModule`, all elements from [FILE_COMMON_ARGUMENTS](https://github.com/ansible/ansible/blob/e9d29b1fe4285d90d7a4506b80260a9e24c3bcea/lib/ansible/module_utils/basic.py#L229-L257) are included in the argument spec. The [files document fragment](https://github.com/ansible/ansible/blob/e9d29b1fe4285d90d7a4506b80260a9e24c3bcea/lib/ansible/plugins/doc_fragments/files.py#L15-L80) only documents a subset of them, though. Missing are:
 - src
 - follow
 - force
 - content
 - backup
 - remote_src
 - regexp
 - delimiter
 - directory_mode

Most module authors using `add_file_common_args=True` are probably not aware that their modules have these options as well.

I don't think these extra options should be added by default if `add_file_common_args=True` is specified.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/module_utils/basic.py

##### ANSIBLE VERSION
```
devel
```

if len(content_types) > 1:
                module.warn(
                    'Received multiple conflicting Content-Type values (%s), using %s' % (', '.join(content_types), content_type)
                )
        if charsets:
            content_encoding = charsets[0]
            if len(charsets) > 1:
                module.warn(
                    'Received multiple conflicting charset values (%s), using %s' % (', '.join(charsets), content_encoding)
                )
        u_content = to_text(content, encoding=content_encoding)
        if any(candidate in content_type for candidate in JSON_CANDIDATES):
            try:
                js = json.loads(u_content)
                uresp['json'] = js
            except Exception:
                if PY2:
                    sys.exc_clear()  
    else:
        u_content = to_text(content, encoding=content_encoding)
    if resp['status'] not in status_code:
        uresp['msg'] = 'Status code was %s and not %s: %s' % (resp['status'], status_code, uresp.get('msg', ''))
        module.fail_json(content=u_content, **uresp)
    elif return_content:
        module.exit_json(content=u_content, **uresp)
    else:
        module.exit_json(**uresp)
if __name__ == '__main__':
    main()