* modify DOCKER_REGISTRY in make script
Signed-off-by: YangKeao <yangkeao@chunibyo.icu>

* align the help message
Signed-off-by: YangKeao <yangkeao@chunibyo.icu>
Co-authored-by: Yue Yang <g1enyy0ung@gmail.com>
Co-authored-by: Ti Chi Robot <ti-community-prow-bot@tidb.io>