Update modules/guides/pages/kubernetes-cluster-domain.adoc

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

Author: dervoeti

modules/guides/pages/kubernetes-cluster-domain.adoc

@@ -9,7 +9,7 @@ The cluster domain can be configured using an environment variable `KUBERNETES_C
 This environment variable can be configured via the helm values property `kubernetesClusterDomain` during the installation of the operators.
 
 ```
-helm install <product>-operator stackable-stable/<product>-operator --set kubernetesClusterDomain="my-cluster.local."
+helm install <product>-operator stackable-stable/<product>-operator --set kubernetesClusterDomain="my.domain."
 ```
 
 Note that if you specify a custom cluster domain we recommend adding a trailing dot (`my.domain.` instead of `my.domain`) to reduce DNS requests (see https://github.com/stackabletech/issues/issues/656 for details).