Fix typo in “Five simple examples”
Fix typo in “Five simple examples”

Summary: Closes https://github.com/facebook/flow/pull/3043

Differential Revision: D4368193

Pulled By: mroch

fbshipit-source-id: 457dae31e2c2d6e4d817338552062cc223de447c

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