By BOB POCKRASS (bob.pockrass@news-jrnl.com) Staff Writer DAYTONA BEACH -- A burst of lightning Thursday afternoon jolted several race fans at Daytona International Speedway. Speedway officials said eight people were treated for minor injuries suffered when lightning struck the vendor display area outside the Speedway grandstands around 3:45 p.m. Six people were treated at care centers at the Speedway and two were transported to Halifax Medical Center. All were released by 5 p.m., Speedway officials said. Treated and released from the Speedway care centers were fans Dwayne Decoux, 26, of Simpsonville, S.C., and his brother, Derek Decoux, 25, of Pace; Alfred...