Update README.md

[yangw-dev]

Fix the bug from the readme

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11924

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures

As of commit f60cc19 with merge base 752f6a7 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention_custom
• pull / unittest-editable / linux / linux-job (gh)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention_custom
• trunk / test-models-macos (resnet50, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention_custom

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[yangw-dev]

I went through the README.md make sure things to make sure things now are properly