##### 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
```

'''
        This method renders the content of the PgHba rules and comments.
        The returning value can be used directly to write to a new file.
        '''
        comment = '\n'.join(self.comment)
        rule_lines = '\n'.join([rule['line'] for rule in self.get_rules(with_lines=True)])
        result = comment + '\n' + rule_lines
        
        if result and result[-1] not in ['\n', '\r']:
            result += '\n'
        return result
    def changed(self):
        '''
        This method can be called to detect if the PgHba file has been changed.
        '''
        return bool(self.diff['before']['pg_hba'] or self.diff['after']['pg_hba'])
class PgHbaRule(dict):