Fix a broken link to the K8s official docs (#2214)

Author: renetapopova

modules/ROOT/pages/clustering/setup/discovery.adoc

@@ -113,7 +113,7 @@ The following settings are used to configure for this scenario:
 * Set `xref:configuration/configuration-settings.adoc#config_dbms.kubernetes.label_selector[dbms.kubernetes.label_selector]` to the label selector for the cluster services.
 For more information, see the https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors[Kubernetes official documentation^].
 * Set xref:configuration/configuration-settings.adoc#config_dbms.kubernetes.discovery.service_port_name[`dbms.kubernetes.discovery.service_port_name]` to the name of the service port used in the Kubernetes service definition for the Core's discovery port.
-For more information, see the https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#serviceport-v1-core[Kubernetes official documentation^].
+For more information, see the https://kubernetes.io/docs/reference/kubernetes-api/service-resources/service-v1/[Kubernetes official documentation^].
 
 With this configuration, `dbms.cluster.endpoints` is not used and any value assigned to it is ignored.