A woman in Northern Virginia says she was shocked and angered after finding a racial slur printed on her Wingstop order receipt and shown on the restaurant’s order tracking screen. The incident allegedly led to the firing of an employee at the location. Nita Sutherland told FOX 5 D.C. that she went to a Wingstop on Lorton Market Street in Fairfax County to buy a meal for her 7-year-old grandson. She said she clearly gave her first name, spelling…