Adding missing call out reference

Author: pneedle-rh

modules/ipi-install-configuring-raid-for-worker-node.adoc

@@ -33,7 +33,7 @@ Because servers with BMC type `irmc` do not support software RAID, the following
 spec:
   raid:
     hardwareRAIDVolumes:
-    - level: "0"
+    - level: "0" <1>
       name: "sda"
       numberOfPhysicalDisks: 1
       rotational: true