Update modules/concepts/pages/service-exposition.adoc

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

Author: sbernauer

modules/concepts/pages/service-exposition.adoc

@@ -5,7 +5,7 @@ This can e.g. be from your internal corporate network when running on bare metal
 
 As of the release 23.4 our operators create a Kubernetes `Service` object to expose the deployed product.
 For security reasons we default to the `ClusterIP` type, with the option to switch to a different type.
-You can specify the type to use using the field `spec.clusterConfig.listenerClass` by setting it to either
+You can specify the type within the custom resource field `spec.clusterConfig.listenerClass` by setting it to either:
 
 * `cluster-internal` => Use `ClusterIP` (default)
 * `external-unstable` => Use `NodePort`