Update toc.yml

Added link to new page articles/ai-services/openai/azure-government.md

Author: challenp

articles/ai-services/openai/toc.yml

@@ -262,6 +262,8 @@ items:
           href: ./how-to/spillover-traffic-management.md
         - name: Azure OpenAI PTU updates
           href: ./concepts/provisioned-migration.md
+        - name: Azure OpenAI PTU in Azure Government
+          href: ./concepts/gov-provisioned.md
       - name: Plan and manage costs
         href: ./how-to/manage-costs.md
       - name: Performance & latency