Qualcomm AI Engine Direct - update llm document

[DannyYuyang-quic]

Summary

• Add --calib_num_fewshot option to control few-shot count for lm_eval calibration tasks
• Update all README example commands from short flags (-b/-s/-m) to flags (--build_folder/--device/--soc_model)

Test plan

LLM CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20449

• 📄 Preview Python docs built from this PR

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 2 New Failures, 3 Unrelated Failures, 1 Unclassified Failure

As of commit d890f2f with merge base e98e74e ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b5dfaa6eca3a2c9c7f3813a501c9abde08685c064bbfcc558ed5c49665c5b41b /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6a6b44e04f45f5f362a36d4235ba891a3094ae167a5a3dc62bdc3427cb3c087a /exec failed with exit code 1

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• periodic / gather-models (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

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

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

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

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[DannyYuyang-quic]

@pytorchbot label "release notes: qualcomm"

[DannyYuyang-quic]

@psiddh Hi, this is a follow-up PR to #20273

Could you please take a look? Thanks!