Update UserGuide.md
Update UserGuide.md

changed some minor errors and ocd-ness
Manish1Dahiya/main,Manish1Dahiya/main,CS2103JAN2017-T15-B3/main,kennyngdsc/addressbook-level4,kennyngdsc/addressbook-level4,CS2103JAN2017-T15-B3/main,lproperty/main,lproperty/main