##### 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
```

b_dest = to_bytes(module.params['dest'], errors='surrogate_or_strict')
            if src.endswith(os.path.sep) and os.path.isdir(module.params['dest']):
                diff_files_changed = copy_diff_files(b_src, b_dest, module)
                left_only_changed = copy_left_only(b_src, b_dest, module)
                common_dirs_changed = copy_common_dirs(b_src, b_dest, module)
                owner_group_changed = chown_recursive(b_dest, module)
                if diff_files_changed or left_only_changed or common_dirs_changed or owner_group_changed:
                    changed = True
            if src.endswith(os.path.sep) and not os.path.exists(module.params['dest']):
                b_basename = to_bytes(os.path.basename(src), errors='surrogate_or_strict')
                b_dest = to_bytes(os.path.join(b_dest, b_basename), errors='surrogate_or_strict')
                b_src = to_bytes(os.path.join(module.params['src'], ""), errors='surrogate_or_strict')
                if not module.check_mode:
                    shutil.copytree(b_src, b_dest, symlinks=not(local_follow))
                chown_recursive(dest, module)
                changed = True
            if not src.endswith(os.path.sep) and os.path.isdir(module.params['dest']):
                b_basename = to_bytes(os.path.basename(src), errors='surrogate_or_strict')
                b_dest = to_bytes(os.path.join(b_dest, b_basename), errors='surrogate_or_strict')
                b_src = to_bytes(os.path.join(module.params['src'], ""), errors='surrogate_or_strict')
                if not module.check_mode and not os.path.exists(b_dest):
                    shutil.copytree(b_src, b_dest, symlinks=not(local_follow))
                    changed = True
                    chown_recursive(dest, module)
                if module.check_mode and not os.path.exists(b_dest):
                    changed = True
                if os.path.exists(b_dest):
                    diff_files_changed = copy_diff_files(b_src, b_dest, module)
                    left_only_changed = copy_left_only(b_src, b_dest, module)
                    common_dirs_changed = copy_common_dirs(b_src, b_dest, module)