Update toc.yml

Author: guywi-ms

articles/azure-monitor/toc.yml

@@ -469,14 +469,14 @@ items:
     items:
     - name: Overview
       href: agents/agents-overview.md
-    - name: Install Azure Monitor Agent
+    - name: Install
       displayName: Azure Monitor agent
       items:
-      - name: Using the agent extension
+      - name: Using the VM extension
         href: agents/azure-monitor-agent-manage.md
       - name: Using Windows client installer (preview)
         href: agents/azure-monitor-agent-windows-client.md
-    - name: Configure data collection
+    - name: Configure
       items:
       - name: Collect events and performance
         displayName: data collection rule,Azure Monitor agent