fix(genapi): avoid break in python snippets for stream

Author: fpagny

pages/generative-apis/how-to/query-language-models.mdx

@@ -250,7 +250,7 @@ The service also supports asynchronous mode for any chat completion.
           if event.type == "response.output_text.delta":
               print(event.delta, end="")
           elif event.type == "response.completed":
-              break
+              continue
 
   asyncio.run(main())
   ```