Replace `make` with `cmake --build .` in the docs (#29798)
Summary:
Inspired by https://discuss.pytorch.org/t/issues-with-tutorial-installing-c-distributions-of-pytorch/33295/11
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29798
Differential Revision: D18504951
Pulled By: ezyang
fbshipit-source-id: 8e80d8891ca85196f00611fe784b2f55659e52ab
