Simplify contributing instructions to recommend `-Pquick-build`
Simplify contributing instructions to recommend `-Pquick-build`

jenkinsci/jenkins,jenkinsci/jenkins,MarkEWaite/jenkins,jenkinsci/jenkins,MarkEWaite/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,damianszczepanik/jenkins,MarkEWaite/jenkins,MarkEWaite/jenkins,MarkEWaite/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,daniel-beck/jenkins,jenkinsci/jenkins,damianszczepanik/jenkins,damianszczepanik/jenkins,MarkEWaite/jenkins,damianszczepanik/jenkins,daniel-beck/jenkins,daniel-beck/jenkins,MarkEWaite/jenkins,damianszczepanik/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,daniel-beck/jenkins,MarkEWaite/jenkins,jenkinsci/jenkins,damianszczepanik/jenkins,jenkinsci/jenkins