Revert D31447616: Quantization docs: consilidate all API references on a single page
Test Plan: revert-hammer
Differential Revision:
D31447616 (https://github.com/pytorch/pytorch/commit/fe86f0e068e07c0e61d79533afa10b1fcd634db1)
Original commit changeset: 2f9c4dac2b2f
fbshipit-source-id: 673368e87399f0a25441688bb9356de5a2f3e66e