As if the drive-by shooting Tuesday at the Clay Terrace housing projects, which left two teens dead and three others wounded, wasn’t tragic enough, the Washington Post is citing police sources today who indicate that one of the slain victims, 15-year-old Davonta Artis, was an innocent bystander. Preliminary word from D.C. police is that the drive-by resulted from a dispute between two rival crews, from 37th Place SE and Clay Terrace, over a set of…