Revert D31447614: Create a documentation page for `torch.ao.quantization.QConfig`
Test Plan: revert-hammer
Differential Revision:
D31447614 (https://github.com/pytorch/pytorch/commit/7332ed13edc509d1fc79e34cb5a83310978b68c5)
Original commit changeset: 5d9dd2a4e864
fbshipit-source-id: 6ac15a956222ca61f7fbb75ed36bcc58b23f0f36