Add note comments to enforce nondeterministic alert documentation (#44140)
Summary:
This PR fulfills Ed's request (https://github.com/pytorch/pytorch/pull/41692#discussion_r473122076) for a strategy to keep the functions that have nondeterministic alerts fully documented.
Part of https://github.com/pytorch/pytorch/issues/15359
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44140
Reviewed By: colesbury
Differential Revision: D23644469
Pulled By: ezyang
fbshipit-source-id: 60936ccced13f071c620f7d25ef6dcbca338de7f