Update documentation to include newer backends

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Preview document: https://docs-preview.pytorch.org/pytorch/executorch/12636/index.html

[pytorch-bot]

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❌ 2 New Failures, 2 Cancelled Jobs

As of commit 0218778 with merge base de24489 ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 014bba41f79c33a54ba107e56d2b37f5fa4ed10cf2ba26e318b9dec357f13986 /exec failed with exit code 1
• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t cbb222620b868425ecb162c6bf945c154b570b23671e8973e2153b998c1cc56c /exec failed with exit code 139

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

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

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