Change TLS encryption title

Author: duongau

articles/frontdoor/TOC.yml

@@ -222,7 +222,7 @@
         href: /security/benchmark/azure/baselines/azure-front-door-security-baseline?toc=/azure/frontdoor/TOC.json
       - name: DDoS protection
         href: front-door-ddos.md
-      - name: End-to-end TLS encryption
+      - name: About TLS encryption
         href: end-to-end-tls.md
       - name: Web Application Firewall
         href: web-application-firewall.md