Update chat.py (Typo "Azure Open AI"→"Azure OpenAI")

https://github.com/Azure-Samples/openai-chat-app-quickstart/blob/main/src/quartapp/chat.py
#PingMSFTDocs

Author: hyoshioka0128

src/quartapp/chat.py

@@ -79,7 +79,7 @@ async def response_stream():
         ] + request_messages
 
         chat_coroutine = bp.openai_client.chat.completions.create(
-            # Azure Open AI takes the deployment name as the model name
+            # Azure OpenAI takes the deployment name as the model name
             model=bp.openai_model,
             messages=all_messages,
             stream=True,