Update ass_fontselect.h
Update ass_fontselect.h

Fix documentation misspellings/texts.
As reported by Clang.
xbmc/libass,ShiftMediaProject/libass,MrSmile/libass,ShiftMediaProject/libass,astiob/libass,Akemi/libass,MrSmile/libass,xbmc/libass,libass/libass,Akemi/libass,astiob/libass,Akemi/libass,libass/libass