cpp doc fix (#16221)
Summary:
Fixed a few C++ API callsites to work with v1.0.1.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16221
Differential Revision: D13759207
Pulled By: yf225
fbshipit-source-id: bd92c2b95a0c6ff3ba5d73cb249d0bc88cfdc340
