Fix a typo in the comment
Fix a typo in the comment

Summary: That's it.

Reviewed By: minjang

Differential Revision: D15264295

fbshipit-source-id: b367c9b2115cdd4e9a999eb875e6afa1e82a747f

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex