Update TOC.yml

Author: wmwxwa

articles/cosmos-db/TOC.yml

@@ -7,7 +7,7 @@
       href: introduction.md
     - name: FAQ
       href: faq.yml
-    - name: 30-day free trial
+    - name: Try Azure Cosmos DB free
       href: try-free.md
     - name: Azure AI Advantage free trial
       href: ai-advantage.md