Revert D23828257: Quantization: add API summary section
Test Plan: revert-hammer
Differential Revision:
D23828257 (https://github.com/pytorch/pytorch/commit/d2bd556e7d311c326b0e056bbba7ff665e2acf8a)
Original commit changeset: 9311ee3f394c
fbshipit-source-id: 80b16fc123191e249e6a070ec5360a15fe91cf61
