add missing yaml tag to resourceTemplate reference

docs/help/operator.md

@@ -762,6 +762,7 @@ spec:
 Occasionally it is necessary to make customisations to the spec of a managed resource. The `resourceTemplate. patch` attribute can be used to apply such customisations. The `patch` is appled by the operator using a [strategic merge](https://kubernetes.io/docs/tasks/manage-kubernetes-objects/update-api-object-kubectl-patch/#notes-on-the-strategic-merge-patch) before submitting to the api server.
 In the following example, a custom security context is added to the internal broker container of the managed StatefulSet by patching just the required attribute. Note: `name` is the mergeKey, it must match that of the managed container with the CR.Name prefix:
 
+```yaml
 apiVersion: broker.amq.io/v1beta1
 kind: ActiveMQArtemis
 metadata:
@@ -779,6 +780,7 @@ spec:
         - name: "broker-container"
           securityContext:
            runAsNonRoot: true
+```
 
 ### Setting  Environment Variables