Update index.yml

Updating link in documentation page

Author: kbrowne8

articles/ai-services/content-understanding/index.yml

@@ -44,7 +44,7 @@ landingContent:
         - text: Try Content Understanding REST API
           url: quickstart/use-rest-api.md
         - text: Try Azure AI Foundry portal
-          url: image/overview.md
+          url: quickstart/use-ai-foundry.md
 
   - title: How-to guides
     linkLists: