Update sap-hana-high-availability.md

Added ls command to list disks as the command listed in article was not working in https://learn.microsoft.com/en-us/azure/sap/workloads/sap-hana-high-availability?tabs=lb-portal%2Csaphanasr#install-sap-hana

Author: dantecit0

articles/sap/workloads/sap-hana-high-availability.md

@@ -144,7 +144,7 @@ Replace `<placeholders>` with the values for your SAP HANA installation.
    1. Run this command to list all the available disks:
 
       ```bash
-      /dev/disk/azure/scsi1/lun*
+      ls /dev/disk/azure/scsi1/lun*
       ```
 
       Example output: