Added noback and nofor as requirement to the correct opcode and corrected examples.
Added noback and nofor as requirement to the correct opcode and corrected examples.

liblouis/liblouis,hammera/liblouis,BueVest/liblouis,IndexBraille/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis,IndexBraille/liblouis,hammera/liblouis,liblouis/liblouis,IndexBraille/liblouis,IndexBraille/liblouis,liblouis/liblouis,IndexBraille/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis