Add references_regions metadata, add period to description metadata

Author: denrea

articles/ai-services/openai/how-to/responses.md

@@ -1,13 +1,14 @@
 ---
 title: Azure OpenAI Responses API
 titleSuffix: Azure OpenAI
-description: Learn how to use Azure OpenAI's new stateful Responses API
+description: Learn how to use Azure OpenAI's new stateful Responses API.
 manager: nitinme
 ms.service: azure-ai-openai
 ms.topic: include
 ms.date: 03/07/2025
 author: mrbullwinkle    
 ms.author: mbullwin
+ms.custom: references_regions
 ---
 
 # Azure OpenAI Responses API (Preview)