Fix some old comment
Fix some old comment

Summary: Not sure what happened here.

Reviewed By: thezhangwei

Differential Revision: D29801992

fbshipit-source-id: b26a52f1b98dc50be4ef53fbe9143a6fbe4212f4

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