OSDOCS-15834 Upate Network Observability references in topic_map

Author: gwynnemonahan

_topic_maps/_topic_map.yml

@@ -3269,9 +3269,9 @@ Topics:
   Dir: network_observability
   Distros: openshift-enterprise,openshift-origin
   Topics:
-  - Name: Network Observability release notes
+  - Name: Network observability release notes
     File: network-observability-operator-release-notes
-  - Name: Network Observability overview
+  - Name: Network observability overview
     File: network-observability-overview
   - Name: Installing the Network Observability Operator
     File: installing-operators
@@ -3306,7 +3306,7 @@ Topics:
     File: flowmetric-api
   - Name: Flows format reference
     File: json-flows-format-reference
-  - Name: Troubleshooting Network Observability
+  - Name: Troubleshooting network observability
     File: troubleshooting-network-observability
 - Name: Power Monitoring
   Dir: power_monitoring