Update QAT README before PTC

[andrewor14]

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[pytorch-bot]

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⏳ 7 Pending, 2 Unrelated Failures

As of commit 06a147d with merge base 35fbac9 ():

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

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

• Run Regression Tests (aarch64) / test-cpu-ops (linux.arm64.2xlarge) (gh) (trunk failure)
  ##[error]The operation was canceled.
• Run Regression Tests (aarch64) / test-cpu-ops (macos-14) (gh) (trunk failure)
  /Users/runner/miniconda3/envs/venv/lib/python3.10/site-packages/executorch/share/cmake/../../include/executorch/runtime/core/memory_allocator.h:143:21: error: no matching function for call to 'mul_overflows'

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