OSDOCS-12809 Monitoring config for managed OpenShift

Adding condition to remove unsupported monitoring config instruction from managed OpenShift.

Author: laubai

observability/monitoring/config-map-reference-for-the-cluster-monitoring-operator.adoc

@@ -18,8 +18,11 @@ toc::[]
 Parts of {product-title} cluster monitoring are configurable.
 The API is accessible by setting parameters defined in various config maps.
 
+ifndef::openshift-rosa,openshift-rosa-hcp,openshift-dedicated[]
 * To configure monitoring components, edit the `ConfigMap` object named `cluster-monitoring-config` in the `openshift-monitoring` namespace.
 These configurations are defined by link:#clustermonitoringconfiguration[ClusterMonitoringConfiguration].
+endif::openshift-rosa,openshift-rosa-hcp,openshift-dedicated[]
+
 * To configure monitoring components that monitor user-defined projects, edit the `ConfigMap` object named `user-workload-monitoring-config` in the `openshift-user-workload-monitoring` namespace.
 These configurations are defined by link:#userworkloadconfiguration[UserWorkloadConfiguration].