Arm backend: Add docstrings for operator_support/right_shift_support.py

[Sebastian-Larsson]

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14430

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❌ 5 New Failures, 2 Unrelated Failures

As of commit a6a15b8 with merge base 8da822c ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
• 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 / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c3fdebf68c13540b754730d78abd8dd8488f5258cfee76b3d32cbb421726ec49 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d
• trunk / test-huggingface-transformers-macos (distilbert|coreml_fp32_gpu|--quantize) / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128

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

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

• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  [ FAILED ] LoggingTest.Utf8Truncation
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  [ FAILED ] LoggingTest.Utf8Truncation

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