Fixed typos in quantization docs / docstrings (#34182)
Summary:
Removed extra back quote character.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34182
Differential Revision: D20320146
Pulled By: jerryzh168
fbshipit-source-id: 33c347711a052cc55f7d1a41ed959dadf99a3d7d
