GitLab

Summary:
One of the docstrings is a disaster see https://pytorch3d.readthedocs.io/en/latest/modules/ops.html

Also some minor fixes I encountered when browsing the code

Reviewed By: bottler

Differential Revision: D38581595

fbshipit-source-id: 3b6ca97788af380a44df9144a6a4cac782c6eab8