net: hns3: fix missing help info for qs shaper in debugfs

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

HNS3 driver can dump qs shaper configs via debugfs, but missing
help info in debugfs for this operation.

Fixes: 584d21b6f3b0 ("net: hns3: add support of configuring bandwidth of VF on the host")

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: Peng Li <lipeng321@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>