Update Qwen3 README.md (pytorch#10882)

Author: jackzhxng

examples/models/qwen3/README.md

@@ -86,3 +86,6 @@ cmake-out/examples/models/llama/llama_main
 ```
 
 To run the model on an example iOS or Android app, see the Llama README's [Step 5: Build Mobile apps](../llama/README.md#step-5-build-mobile-apps) section.
+
+### FAQ
+For more help with exporting or running this model, feel free to ask in our [discord channel](https://lnkd.in/gWCM4ViK).