Update documentation on why _cudnn_init_dropout_state looks the way it is. (#33347)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33347
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D19975410
Pulled By: ezyang
fbshipit-source-id: eb729870c2d279d7d9ca43c92e514fe38dedb06d
