Update 02-troubleshooting.md
Update 02-troubleshooting.md

Summary:
fix repeating "usually" twice
Closes https://github.com/facebook/flow/pull/2573

Differential Revision: D3966917

Pulled By: mroch

fbshipit-source-id: 9b752870d60e002659d73807965d7bec6b06e4f9

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