Arm backend: Update docstrings and docgen documents

[tom-arm]

• Update docstrings for consistency
• Update some documents in the docgen directory

Signed-off-by: Tom Allsop tom.allsop@arm.com

Change-Id: I5a3b8feb4bcba7ad852a61d67ae3fa7bb43bd994

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17067

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 6 New Failures, 1 Unrelated Failure

As of commit eab7b3f with merge base ec4c462 ():

NEW FAILURES - The following jobs have failed:

• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 66865de6e386ec4354fb1628970071af5e22fca560140ccfe2dc9b85f62fb83b /exec failed with exit code 1
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t c089cd10ff5e909b51140911a33d3964dbefb88ea99540d0420ecc8b6824a57d /exec failed with exit code 3
• trunk / test-arm-backend-ethos-u (test_model_smollm2-135M) / linux-job (gh)
  RuntimeError: Command docker exec -t cd1fafb1f354cf0ef58e07995de3668cc90d1c0d0f9b35e20642eff41469b467 /exec failed with exit code 1
• trunk / test-huggingface-transformers-macos (smollm2-135m|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-multimodal-macos (gemma3-4b) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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-buck / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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