Change headings in TOC

Author: AbbyMSFT

articles/azure-monitor/toc.yml

@@ -19,9 +19,9 @@ items:
     href: best-practices-plan.md
   - name: Configure data collection
     href: best-practices-data-collection.md
-  - name: Analysis and visualizations
+  - name: Understand analysis and visualization tools
     href: best-practices-analysis.md
-  - name: Configure alerts and automated actions
+  - name: Plan alerts and automated actions
     href: alerts/alerts-plan.md
   - name: Optimize costs
     href: best-practices-cost.md