##### 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
```

self.add_path_info(kwargs)
        if 'invocation' not in kwargs:
            kwargs['invocation'] = {'module_args': self.params}
        if 'warnings' in kwargs:
            if isinstance(kwargs['warnings'], list):
                for w in kwargs['warnings']:
                    self.warn(w)
            else:
                self.warn(kwargs['warnings'])
        warnings = get_warning_messages()
        if warnings:
            kwargs['warnings'] = warnings
        if 'deprecations' in kwargs:
            if isinstance(kwargs['deprecations'], list):
                for d in kwargs['deprecations']:
                    if isinstance(d, SEQUENCETYPE) and len(d) == 2:
                        self.deprecate(d[0], version=d[1])
                    elif isinstance(d, Mapping):
                        self.deprecate(d['msg'], version=d.get('version', None))
                    else:
                        self.deprecate(d)  
            else:
                self.deprecate(kwargs['deprecations'])  
        deprecations = get_deprecation_messages()
        if deprecations:
            kwargs['deprecations'] = deprecations
        kwargs = remove_values(kwargs, self.no_log_values)
        print('\n%s' % self.jsonify(kwargs))
    def exit_json(self, **kwargs):