Update TOC.yml

Author: ProfessorKendrick

articles/api-management/TOC.yml

@@ -711,6 +711,8 @@
     href: https://aka.ms/API-Security-EBook
   - name: Web API implementation
     href: /azure/architecture/best-practices/api-implementation?toc=%2Fazure%2Fapi-management%2Ftoc.json&bc=/azure/api-management/breadcrumb/toc.json
+  - name: RESTful web API design
+    href: /azure/architecture/best-practices/api-design?toc=%2Fazure%2Fapi-management%2Ftoc.json&bc=/azure/api-management/breadcrumb/toc.json  
   - name: Community
     href: https://aka.ms/apimlove
   - name: FAQ