Update docs to point to new sdpa_kernel context manager

[drisspg]

Summary

Updates the SDPA docs to fix some small inaccuracies and points to the new sdpa_kernel context manger. The Enum like type binded from cpp SDPBackend does not render its fields for some reason. Manually list them instead for now

cc @svekars @brycebortree

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit e346df7 with merge base 4f0481e ():

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

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

• trunk / linux-focal-rocm6.0-py3.8 / test (default, 1, 1, linux.rocm.gpu) (gh)
  test_autograd.py::TestAutograd::test_pynode_destruction_deadlock

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[drisspg]

@pytorchbot merge

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[pytorchmergebot]

Merge failed

Reason: 1 jobs have failed, first few of them are: .github/workflows/trunk.yml / linux-focal-rocm6.0-py3.8 / test (default, 1, 1, linux.rocm.gpu)

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[drisspg]

@pytorchbot merge -f "unrelated failures"

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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