add healthManagerImage to Broker deployment sample

Author: ryanwinter

articles/iot-operations/manage-mqtt-connectivity/howto-configure-availability-scale.md

@@ -122,6 +122,10 @@ spec:
     pullPolicy: Always
     repository: mcr.microsoft.com/azureiotoperations/dmqtt-pod
     tag: 0.4.0-preview
+  healthManagerImage:
+    pullPolicy: Always
+    repository: mcr.microsoft.com/azureiotoperations/dmqtt-operator
+    tag: 0.4.0-preview
   memoryProfile: medium
   mode: distributed
   cardinality: