Update getting-started-setup.md and fix missing command

[arkylin]

Summary

Fixed: Error: /home/i/executorch/cmake-out/cmake-out is not a directory

Test

(executorch) i@ARX8:~/executorch/cmake-out$ cmake --build cmake-out --target executor_runner -j9
Error: /home/i/executorch/cmake-out/cmake-out is not a directory
(executorch) i@ARX8:~/executorch/cmake-out$ cd ..
(executorch) i@ARX8:~/executorch$ cmake --build cmake-out --target executor_runner -j9

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7438

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit e6d9acf with merge base 8ee637e ():
💚 Looks good so far! There are no failures yet. 💚

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[arkylin]

@pytorchbot label "module: doc"

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[arkylin]

@pytorchbot label "release notes: misc"

[cccclai]

Thank you