Add missing job_name to schedule.job_status example

The module `schedule.job_status` requires a job name, but the example
does not mention that.

Signed-off-by: Benjamin Drung <benjamin.drung@ionos.com>

salt/modules/schedule.py

@@ -1347,7 +1347,7 @@ def job_status(name):
 
     .. code-block:: bash
 
-        salt '*' schedule.job_status
+        salt '*' schedule.job_status job_name
 
     """