##### 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 spec is None:
            spec = self.argument_spec
        if param is None:
            param = self.params
        for (k, v) in spec.items():
            fallback = v.get('fallback', (None,))
            fallback_strategy = fallback[0]
            fallback_args = []
            fallback_kwargs = {}
            if k not in param and fallback_strategy is not None:
                for item in fallback[1:]:
                    if isinstance(item, dict):
                        fallback_kwargs = item
                    else:
                        fallback_args = item
                try:
                    param[k] = fallback_strategy(*fallback_args, **fallback_kwargs)
                except AnsibleFallbackNotFound:
                    continue
    def _load_params(self):