Update prompty-output-format.md

Author: lalala123123

docs/how-to-guides/develop-a-prompty/prompty-output-format.md

@@ -22,6 +22,7 @@ model:
   api: chat
   configuration:
     type: azure_openai
+    connection: open_ai_connection
     azure_deployment: gpt-35-turbo-0125
   parameters:
     max_tokens: 128
@@ -267,4 +268,4 @@ result = prompty_func(first_name="John", last_name="Doh", question=question)
 # Type of the result is generator
 for item in result:
     print(item, end="")
-```
+```