Recommend `~` and `bitwise_not()` when user tries to apply neg (`-`) on a bool tensor.
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/23621
Test Plan: Imported from OSS
Differential Revision: D16656729
Pulled By: ezyang
fbshipit-source-id: d107e8caa2ccfa6ff8a1bd8a31b4d79f142d68fb
