Update backup-azure-arm-vms-prepare.md

The following fact hasn't been mentioned anywhere in the doc so I've added it:

"To change Recovery Services vault of a VM, firstly you need to stop the backup then you can assign a new vault to the VM."

Author: azarboon

articles/backup/backup-azure-arm-vms-prepare.md

@@ -91,7 +91,8 @@ To apply a backup policy to your Azure VMs, follow these steps:
      !["Select virtual machines" pane](./media/backup-azure-arm-vms-prepare/select-vms-to-backup.png)
 
     >[!NOTE]
-    > All the VMs in the same region and subscription as that of the vault are available to configure backup. When configuring backup, you can browse to the virtual machine name and its resource group, even though you don’t have the required permission on those VMs. If your VM is in soft deleted state, then it won't be visible in this list. If you need to re-protect the VM, then you need to wait for the soft delete period to expire or undelete the VM from the soft deleted list. For more information, see [the soft delete for VMs article](soft-delete-virtual-machines.md#soft-delete-for-vms-using-azure-portal).
+    >- All the VMs in the same region and subscription as that of the vault are available to configure backup. When configuring backup, you can browse to the virtual machine name and its resource group, even though you don’t have the required permission on those VMs. If your VM is in soft deleted state, then it won't be visible in this list. If you need to re-protect the VM, then you need to wait for the soft delete period to expire or undelete the VM from the soft deleted list. For more information, see [the soft delete for VMs article](soft-delete-virtual-machines.md#soft-delete-for-vms-using-azure-portal).
+    >- To change Recovery Services vault of a VM, firstly you need to stop the backup then you can assign a new vault to the VM.
 
 1. In **Backup**, select **Enable backup**. This deploys the policy to the vault and to the VMs, and installs the backup extension on the VM agent running on the Azure VM.