stroker: fix wording of algorithm description
stroker: fix wording of algorithm description

libass/libass,Akemi/libass,astiob/libass,MrSmile/libass,libass/libass,ShiftMediaProject/libass,MrSmile/libass,xbmc/libass,xbmc/libass,Akemi/libass,astiob/libass,Akemi/libass,ShiftMediaProject/libass