Update api_ref_quantization.rst

[jerryzh168]

Fixes https://pytorch.org/ao/stable/api_ref_quantization.html, which is empty right now

Test: fixed in the PR: https://docs-preview.pytorch.org/pytorch/ao/1408/api_ref_quantization.html

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit a104e6b with merge base 19b3bb5 ():

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

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

• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure)
  test/integration/test_integration.py::TestSubclass::test_int8_dynamic_quant_subclass_api_5_cuda

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