##### 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
```

"""Give a weight on the type of this source.
        Basically make sure that IPv6Networks are sorted higher than IPv4Networks.
        This is a 'when all else fails' solution in __lt__.
        """
        if self['type'] == 'local':
            return 3
        sourceobj = self.source()
        if isinstance(sourceobj, ipaddress.IPv4Network):
            return 2
        if isinstance(sourceobj, ipaddress.IPv6Network):
            return 1
        if isinstance(sourceobj, str):
            return 0
        raise PgHbaValueError('This source {0} is of an unknown type...'.format(sourceobj))
    def db_weight(self):
        """Report the weight of the database.
        Normally, just 1, but for replication this is 0, and for 'all', this is more than 2.
        """
        if self['db'] == 'all':
            return 100000
        if self['db'] == 'replication':
            return 0
        if self['db'] in ['samerole', 'samegroup']:
            return 1
        return 1 + self['db'].count(',')
    def user_weight(self):