Revise ExecuTorch documentation for Apple runtime

[shoumikhin]

No description provided.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15293

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❗ 1 Active SEVs

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• AWS was down, GHA infrastructure effected / recovering

❌ 2 New Failures, 2 Unrelated Failures

As of commit 1147cf4 with merge base 9152f0a ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t da6ca050e34c5b2a1d9c35f79e82e7cb015c0c4905d134fc96e44be612bc5c27 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 84e998ce265e16dd1d1f9866ba2a306f41b2f14edf612042f22a8a5f6b0334f3 /exec failed with exit code 1

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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