Documentation polishing related to delegates

[pytorchbot]

Summary:

1. backend-delegates-dependencies.md - fix typos
2. backend-delegates-integration.md - a bit polishing, use bullet point instead of plain text
3. debug-backend-delegate.md - use a real model so users can copy paste, also adapt to the API changes

Differential Revision: D83186517

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14672

• 📄 Preview Python docs built from this PR

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❌ 11 New Failures, 3 Cancelled Jobs, 1 Unrelated Failure

As of commit 5c57cd1 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / windows (pybind) / build (gh)
• Build Presets / windows (windows) / build (gh)
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-editable / windows / windows-job (gh)
  Process completed with exit code 1.
• pull / unittest-nxp-neutron / linux-job (gh)
  test_split_group_convolution__2d_1_group_3

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-llava-runner-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

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

• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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