undo toc change

Author: PatrickFarley

articles/ai-services/content-safety/toc.yml

@@ -91,8 +91,6 @@ items:
     items:
       - name: Set up Virtual Networks
         href: ../cognitive-services-virtual-networks.md?context=/azure/ai-services/content-safety/context/context
-      - name: Use customer-managed keys 
-        href: ./encrypt-data-at-rest.md
 
 - name: Reference
   items: