Add missing backslashes in example run section

[Conarnar]

Summary

Missing backslashes in Qwen 3 README.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13603

• 📄 Preview Python docs built from this PR

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❌ 11 New Failures

As of commit e7f5d8f with merge base 45e7810 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (ios-simulator) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / apple (llm) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / apple (profiling) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  RuntimeError: Command docker exec -t 82966f2109a167a994ad96a812444f97b60482a93949799e5fd1412ef8ee6abb /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  curl: (22) The requested URL returned error:
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  curl: (22) The requested URL returned error:
• pull / test-models-linux-basic (mv3, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh)
  RuntimeError: Command docker exec -t c1e1c68ecdc713d5a5314f9dc19f6529220dd4b6f8f5a863f5f919e1a25b0d95 /exec failed with exit code 1
• pull / test-models-linux-basic (vit, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh)
  RuntimeError: Command docker exec -t 4d809da4aad42e4055ad5d3248af03eaf6c51e04bd8941c94a1bc403b50fc601 /exec failed with exit code 1
• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, cmake, linux.arm64.2xlarge, execut... / linux-job (gh)
  RuntimeError: Command docker exec -t 92f5a78a51476ad7f580d2f61599d932f85f764d929817a46b0bcf231e7616aa /exec failed with exit code 1
• pull / test-static-llama-qnn-linux / linux-job (gh)
  curl: (22) The requested URL returned error:
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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