Fixed incorrect spelling in copyright notice
Fixed incorrect spelling in copyright notice

sanyaade-g2g-repos/libass,Akemi/libass,stps/libass,grigorig/libass,torque/libass,mwgoldsmith/libass,stps/libass,astiob/libass,libass/libass,Akemi/libass,mwgoldsmith/libass,Akemi/libass,pigoz/libass-ct,torque/libass,mwgoldsmith/libass,ShiftMediaProject/libass,ShiftMediaProject/libass,sanyaade-g2g-repos/libass,grigorig/libass,xbmc/libass,pigoz/libass-ct,pigoz/libass-ct,sanyaade-g2g-repos/libass,MrSmile/libass,astiob/libass,stps/libass,xbmc/libass,torque/libass,MrSmile/libass,libass/libass