update TOC entry

Author: msakande

articles/ai-foundry/toc.yml

@@ -19,11 +19,7 @@ items:
   - name: Data, privacy, and security for Model Catalog
     href: how-to/concept-data-privacy.md
   - name: Model lifecycle and retirement
-    items:
-    - name: Models Sold Directly by Azure and Models from Partners and Community
-      href: concepts/model-lifecycle-retirement.md
-    - name: Azure OpenAI models
-      href: ../ai-services/openai/concepts/model-retirements.md?context=/azure/ai-foundry/context/context
+    href: concepts/model-lifecycle-retirement.md
   - name: Choose a model for your use case
     items:
     - name: Model leaderboards