Update Core ML Backend Doc

[YifanShenSZ]

Update Core ML backend doc on:

1. Partitioner
2. Quantizer

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3188

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 430f12b with merge base ee8c3a6 ():

NEW FAILURE - The following job has failed:

• Apple / upload-frameworks-ios (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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

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

• pull / unittest / macos (buck2) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[YifanShenSZ]

@cymbalrush feel free to push more commits on runtime doc 🙏

@pulkital feel free to push more commits to polish quantizer doc 🙏

[cymbalrush]

Updated tutorial.

[cymbalrush]

Rebased on main.

[cccclai]

have you tried llama3? If llama2 works, llama3 should be just out of box.

[cymbalrush]

Not yet, going to try today.

[facebook-github-bot]

@cccclai has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cccclai merged this pull request in c004efe.

[cymbalrush]

@pytorchbot cherry-pick --onto release/0.2 -c docs

[pytorchbot]

Cherry picking #3188

The cherry pick PR is at #3249

Details for Dev Infra team

Raised by workflow job