Update docs/modules/opensearch/pages/usage-guide/listenerclass.adoc

Co-authored-by: Siegfried Weber <mail@siegfriedweber.net>

Author: adwk67

docs/modules/opensearch/pages/usage-guide/listenerclass.adoc

@@ -2,7 +2,7 @@
 :description: Configure OpenSearch service exposure with ListenerClasses: cluster-internal, external-unstable, or external-stable.
 
 The operator deploys a xref:listener-operator:listener.adoc[Listener] for OpenSearch role-groups.
-The listener defaults to only being accessible from within the Kubernetes cluster, but this can be changed by setting `.spec.nodes.roleGroups.{role-group-name}.config.listenerClass`:
+The listener defaults to only being accessible from within the Kubernetes cluster, but this can be changed by setting `.spec.nodes.roleGroups.\{role-group-name}.config.listenerClass`:
 
 [source,yaml]
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