##### 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
```

for key, value in rule.items():
            if value:
                self[key] = value
        
        for key in ['method', 'type']:
            if key not in self:
                raise PgHbaRuleError('Missing {0} in rule {1}'.format(key, self))
        if self['method'] not in PG_HBA_METHODS:
            msg = "invalid method {0} (should be one of '{1}')."
            raise PgHbaRuleValueError(msg.format(self['method'], "', '".join(PG_HBA_METHODS)))
        if self['type'] not in PG_HBA_TYPES:
            msg = "invalid connection type {0} (should be one of '{1}')."
            raise PgHbaRuleValueError(msg.format(self['type'], "', '".join(PG_HBA_TYPES)))
        if self['type'] == 'local':
            self.unset('src')
            self.unset('mask')
        elif 'src' not in self:
            raise PgHbaRuleError('Missing src in rule {1}'.format(self))
        elif '/' in self['src']:
            self.unset('mask')
        else:
            self['src'] = str(self.source())
            self.unset('mask')
    def unset(self, key):
        '''
        This method is used to unset certain columns if they exist
        '''
        if key in self:
            del self[key]
    def line(self):