[PR] Typo fix
[PR] Typo fix

Summary: Closes https://github.com/facebook/flow/pull/3634

Differential Revision: D4819912

Pulled By: samwgoldman

fbshipit-source-id: d95e41cf24d6d0e260c4dad4af611e64be7d4d02

fletcherw/flow,TiddoLangerak/flow,gabelevi/flow,nmote/flow,TiddoLangerak/flow,TiddoLangerak/flow,JonathanUsername/flow,facebook/flow,samwgoldman/flow,gabelevi/flow,jamesgpearce/flow,ylu1317/flow,nmote/flow,nmote/flow,gabelevi/flow,JonathanUsername/flow,claudiopro/flow,fletcherw/flow,mroch/flow,facebook/flow,facebook/flow,ylu1317/flow,MichaelDeBoey/flow,JonathanUsername/flow,samwgoldman/flow,JonathanUsername/flow,claudiopro/flow,MichaelDeBoey/flow,mroch/flow,popham/flow,ylu1317/flow,jamesgpearce/flow,AgentME/flow,nmote/flow,samwgoldman/flow,mroch/flow,popham/flow,ylu1317/flow,gabelevi/flow,AgentME/flow,TiddoLangerak/flow,jamesgpearce/flow,popham/flow,mroch/flow,claudiopro/flow,samwgoldman/flow,fletcherw/flow,jamesgpearce/flow,samwgoldman/flow,AgentME/flow,nmote/flow,gabelevi/flow,claudiopro/flow,JonathanUsername/flow,gabelevi/flow,mroch/flow,ylu1317/flow,popham/flow,AgentME/flow,JonathanUsername/flow,MichaelDeBoey/flow,popham/flow,jamesgpearce/flow,popham/flow,gabelevi/flow,AgentME/flow,nmote/flow,mroch/flow,JonathanUsername/flow,facebook/flow,facebook/flow,samwgoldman/flow,TiddoLangerak/flow,mroch/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,nmote/flow,fletcherw/flow,fletcherw/flow,samwgoldman/flow,fletcherw/flow,claudiopro/flow,facebook/flow,jamesgpearce/flow,popham/flow,jamesgpearce/flow,facebook/flow