Update TOC

Author: pkhandavilli

articles/container-instances/TOC.yml

@@ -77,6 +77,8 @@
     href: container-instances-virtual-network-concepts.md
   - name: Confidential container groups
     href: container-instances-confidential-overview.md
+  - name: Attestation in Confidential container 
+    href: confidential-containers-attestation-concepts.md 
 - name: How-to guides
   items:
   - name: Deploy