Adds Monitoring ConfigMap ref.

Author: Robert Krátký

_topic_maps/_topic_map.yml

@@ -2229,6 +2229,8 @@ Topics:
   File: accessing-third-party-monitoring-apis
 - Name: Troubleshooting monitoring issues
   File: troubleshooting-monitoring-issues
+- Name: ConfigMap reference for Cluster Monitoring Operator
+  File: configmap-reference-for-cluster-monitoring-operator
 ---
 Name: Scalability and performance
 Dir: scalability_and_performance