[ez] Add docblock for SchedulerNode.codegen

[bobrenjc93]

Stack from ghstack (oldest at bottom):

• -> [ez] Add docblock for SchedulerNode.codegen #156718
• [ez] add docblock and comments to simd.split_and_set_ranges #156717
• [ez] fix typo in select_algorithm.py #156625

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/156718

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 139663a with merge base 69e2230 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / linux-jammy-py3-clang12-executorch / build (gh) (trunk failure)
  Final attempt failed. Child_process exited with error code 1

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[bobrenjc93]

@pytorchbot merge -i

[pytorchmergebot]

Merge started

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