adding preview

Author: aahill

articles/ai-services/openai/how-to/network-security-perimeter.md

@@ -9,7 +9,7 @@ ms.author: aahi
 ms.service: azure-ai-openai
 ---
 
-# Add an Azure OpenAI service to a network security perimeter
+# Add an Azure OpenAI service to a network security perimeter (preview)
 
 > [!IMPORTANT]
 > * Azure OpenAI service support for network security perimeter is in public preview under supplemental terms of use. It's available in regions providing the feature. This preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.

articles/ai-services/openai/toc.yml

@@ -269,7 +269,7 @@ items:
         href: encrypt-data-at-rest.md
       - name: Managed identity
         href: ./how-to/managed-identity.md
-      - name: Network security perimeter
+      - name: Network security perimeter (preview)
         href: ./how-to/network-security-perimeter.md
   - name: Service management
     items: