[Improvement][script] daemon script usage (#3968)

* Improvement daemon script usage

* don't remove status command

don't remove status command

Co-authored-by: dailidong <dailidong66@gmail.com>

script/dolphinscheduler-daemon.sh

@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-usage="Usage: dolphinscheduler-daemon.sh (start|stop|status) <command> "
+usage="Usage: dolphinscheduler-daemon.sh (start|stop|status) <api-server|master-server|worker-server|alert-server> "
 
 # if no args specified, show usage
 if [ $# -le 1 ]; then