fix toc entry

Author: msakande

articles/ai-foundry/toc.yml

@@ -55,7 +55,7 @@ items:
     - name: Compare models in leaderboards
       href: how-to/benchmark-model-in-catalog.md
   - name: Explore the model playgrounds
-    href: concepts/model-playgrounds.md
+    href: concepts/concept-playgrounds.md
   - name: Deploy Azure AI Foundry Models
   - name: Deployment options in Azure AI Foundry portal
     href: concepts/deployments-overview.md