Added documentation for Checkout
Added documentation for Checkout

georgemarshall/DefinitelyTyped,chrootsu/DefinitelyTyped,zuzusik/DefinitelyTyped,mcliment/DefinitelyTyped,nycdotnet/DefinitelyTyped,QuatroCode/DefinitelyTyped,abbasmhd/DefinitelyTyped,dsebastien/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,rolandzwaga/DefinitelyTyped,benishouga/DefinitelyTyped,nycdotnet/DefinitelyTyped,minodisk/DefinitelyTyped,zuzusik/DefinitelyTyped,AgentME/DefinitelyTyped,magny/DefinitelyTyped,one-pieces/DefinitelyTyped,isman-usoh/DefinitelyTyped,arusakov/DefinitelyTyped,markogresak/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,borisyankov/DefinitelyTyped,amir-arad/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,isman-usoh/DefinitelyTyped,georgemarshall/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,georgemarshall/DefinitelyTyped,benishouga/DefinitelyTyped,ashwinr/DefinitelyTyped,abbasmhd/DefinitelyTyped,alexdresko/DefinitelyTyped,aciccarello/DefinitelyTyped,georgemarshall/DefinitelyTyped,arusakov/DefinitelyTyped,AgentME/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,dsebastien/DefinitelyTyped,alexdresko/DefinitelyTyped,jimthedev/DefinitelyTyped,AgentME/DefinitelyTyped,jimthedev/DefinitelyTyped,zuzusik/DefinitelyTyped,rolandzwaga/DefinitelyTyped,ashwinr/DefinitelyTyped,arusakov/DefinitelyTyped,benliddicott/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,AgentME/DefinitelyTyped,magny/DefinitelyTyped,chrootsu/DefinitelyTyped,benishouga/DefinitelyTyped,aciccarello/DefinitelyTyped,aciccarello/DefinitelyTyped,QuatroCode/DefinitelyTyped,jimthedev/DefinitelyTyped,minodisk/DefinitelyTyped,borisyankov/DefinitelyTyped