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.

❌ 2 New Failures, 1 Unrelated Failure

As of commit 61a2119 with merge base 6364277 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7c410fb57abc1ce8559d2439d9f554f18bb27d0a0c15b1b83136a781d7a80868 /exec failed with exit code 3
• trunk / test-arm-backend-ethos-u (test_model_smollm2-135M) / linux-job (gh)
  RuntimeError: Command docker exec -t 0929ed0e3b41760f22f9011211ae7c8433012c66beb300717dd08486c6ab68bf /exec failed with exit code 2

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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[tom-arm]

Failures seem unrelated

[zingo]

Arm backend tests fail: test_model_smollm2-135M Is a known fails and unrelated