Remove service-level TN

Author: psanapathi

articles/azure-health-insights/TOC.yml

@@ -25,7 +25,5 @@ items:
 - name: About Responsible AI
   expanded: true
   items:
-    - name: Transparency note for Project Health Insights
-      href: responsible-ai/transparency-note.md
     - name: Data, privacy, and security
       href: responsible-ai/data-privacy-security.md