Rename variables in test to better indicate types.
Rename variables in test to better indicate types.

Summary: Suffixing these variable names with “Field” makes it more clear that we're making expectations on instances of `RelayQueryField`.

Reviewed By: yungsters

Differential Revision: D2859630

fb-gh-sync-id: b34f251c823377643ce14169767da54065ac329c

yungsters/relay,kassens/relay,josephsavona/relay,cpojer/relay,chirag04/relay,atxwebs/relay,apalm/relay,yungsters/relay,benjaminogles/relay,wincent/relay,wincent/relay,dbslone/relay,benjaminogles/relay,NevilleS/relay,xuorig/relay,chirag04/relay,voideanvalue/relay,josephsavona/relay,freiksenet/relay,atxwebs/relay,atxwebs/relay,voideanvalue/relay,rosskevin/relay,gabelevi/relay,zpao/relay,wincent/relay,kassens/relay,NevilleS/relay,rosskevin/relay,wincent/relay,gabelevi/relay,kassens/relay,josephsavona/relay,cpojer/relay,chentsulin/relay,xuorig/relay,xuorig/relay,mroch/relay,chirag04/relay,zpao/relay,cesarandreu/relay,venepe/relay,apalm/relay,iamchenxin/relay,dbslone/relay,kassens/relay,facebook/relay,kassens/relay,xuorig/relay,voideanvalue/relay,xuorig/relay,NevilleS/relay,cesarandreu/relay,freiksenet/relay,chentsulin/relay,venepe/relay,gabelevi/relay,atxwebs/relay,voideanvalue/relay,mroch/relay,facebook/relay,wincent/relay,voideanvalue/relay,facebook/relay,cpojer/relay,freiksenet/relay,yungsters/relay,chentsulin/relay,xuorig/relay,iamchenxin/relay,iamchenxin/relay,zpao/relay,benjaminogles/relay,cpojer/relay,apalm/relay,kassens/relay,wincent/relay,facebook/relay,iamchenxin/relay,cesarandreu/relay,facebook/relay,venepe/relay,facebook/relay,voideanvalue/relay,mroch/relay