Revert D31447612: Create a documentation page for FX graph mode quantization APIs
Test Plan: revert-hammer
Differential Revision:
D31447612 (https://github.com/pytorch/pytorch/commit/a89ac3138e37d847f1c1e4c5beeb6303768ebedf)
Original commit changeset: 07d0a6137f15
fbshipit-source-id: f2cba7d835011500580b4ab9cff72171280ee18b
