Update model-catalog-overview.md

Author: Saisang

articles/ai-studio/how-to/model-catalog-overview.md

@@ -7,6 +7,7 @@ ms.service: azure-ai-studio
 ms.custom:
   - ignite-2023
   - build-2024
+  - ai-learning-hub
 ms.topic: how-to
 ms.date: 5/21/2024
 ms.reviewer: jcioffi