update preInstallNotes for marathon-lb (#773)
update preInstallNotes for marathon-lb (#773)

* update preInstallNotes for marathon-lb

* fix typos

AppliedIS/universe,NimaVaziri/universe,yuchaoran2011/universe,dbtucker/universe,AppliedIS/universe,ksivask/universe,madanadit/universe,mesosphere/universe,BuoyantIO/universe,dbtucker/universe,mwl/universe,mwl/universe,mesosphere/universe,BuoyantIO/universe,NimaVaziri/universe,BuoyantIO/universe,madanadit/universe,niteshch207/universe,aloismayr/universe,yuchaoran2011/universe,yuchaoran2011/universe,dbtucker/universe,niteshch207/universe,aloismayr/universe,NimaVaziri/universe,AppliedIS/universe,ksivask/universe,aloismayr/universe,niteshch207/universe,ksivask/universe,madanadit/universe