Merge pull request #203900 from hhunter-ms/hh-1963372

[Change Analysis] add doc to TOC

Author: ShannonLeavitt

articles/azure-monitor/toc.yml

@@ -1170,6 +1170,8 @@ items:
     items:
     - name: Overview
       href: change/change-analysis.md
+    - name: Enable Change Analysis
+      href: change/change-analysis-enable.md
     - name: Visualizations
       href: change/change-analysis-visualizations.md
     - name: Azure PowerShell