Update TOC.yml

Author: wmwxwa

articles/cosmos-db/TOC.yml

@@ -40,6 +40,8 @@
       items:
         - name: AI agent
           href: ai-agents.md
+        - name: Real-time custom content generation
+          href: ../mongodb/vcore/ai-advertisement-generation.md    
         - name: Azure AI Advantage free trial
           href: ai-advantage.md
 - name: NoSQL