Grammar Changes (#42076)
Summary:
Small grammatical updates.
![Screenshot (188)](https://user-images.githubusercontent.com/56619747/88471271-02723480-cf25-11ea-8fd1-ae98d5ebcc86.png)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42076
Reviewed By: mrshenli
Differential Revision: D22756651
Pulled By: ngimel
fbshipit-source-id: e810eb7397a5831d801348c8fff072854658830e