A racial slur was scrawled on the dorm room door of a Black student at Rowan University in Glassboro over the weekend, school officials said. The student discovered the slur when she returned to her room in Holly Pointe Commons late Saturday after being in a nearby hallway talking to friends, according her sister. She reported it to campus police the next afternoon. School officials said they are investigating the incident and that the person responsible will be subject to disciplinary and legal action. “It’s deeply troubling whenever one of our own faces an ugly, racist act on campus,” univer…