Fix typo in comment
Fix typo in comment

Reviewed By: samwgoldman

Differential Revision: D22059259

fbshipit-source-id: 5dd0445ac3ad39d057f18c707e1d376d0fc7705b

facebook/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow