Fixed trivial typos in Dropout2D and Dropout3D classes (#15200)
Summary:
Fixed trivial typos in Dropout2D and Dropout3D classes
weiyangfb
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15200
Differential Revision: D13537888
Pulled By: ezyang
fbshipit-source-id: 8fb06027ca663a2e4bfa016af400698ae3c88ad1
