Arm backend: Adjust docstring formatting of operators with docformatter

[Sebastian-Larsson]

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17198

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❌ 3 New Failures

As of commit 896532e with merge base 3b819a2 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 22fcbe97d61d651706497f1b4b0ca8ce722c780533466ecb3d0ab84475254100 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ab53c7863c4db2117ab7bcfce6e39b0b60da845edafefff1a02b88929f96db5b /exec failed with exit code 1
• trunk / test-mcu-cortex-m-backend / linux-job (gh)
  RuntimeError: Command docker exec -t 79fa9a58364fd0db079fea5388916c05c0745a701a5452f59e5a874db091bab9 /exec failed with exit code 1

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[zingo]

If possible merge after #17200