##### 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 os.path.isdir(to_bytes(source, errors='surrogate_or_strict')):
            
            source_files = _walk_dirs(source, local_follow=local_follow,
                                      trailing_slash_detector=self._connection._shell.path_has_trailing_slash)
            
            
            if not self._connection._shell.path_has_trailing_slash(dest):
                dest = self._connection._shell.join_path(dest, '')
            
            
            
        else:
            source_files['files'] = [(source, os.path.basename(source))]
        changed = False
        module_return = dict(changed=False)
        
        
        module_executed = False
        
        dest = self._remote_expand_user(dest)
        implicit_directories = set()
        for source_full, source_rel in source_files['files']:
            
            
            
            if source_files['directories']:
                follow = False
            else:
                follow = boolean(self._task.args.get('follow', False), strict=False)
            module_return = self._copy_file(source_full, source_rel, content, content_tempfile, dest, task_vars, follow)