NEWS: revise platform-specific descriptions
NEWS: revise platform-specific descriptions

ShengYenPeng/libchewing,cwlin/libchewing,yan12125/libchewing,hiunnhue/libchewing,bbyykk/libtaigi,robert501128/libchewing,Chocobo1/libchewing,Chocobo1/libchewing,yan12125/libchewing,robert501128/libchewing,chewing/libchewing,cwlin/libchewing,Chocobo1/libchewing,PeterDaveHello/libchewing,yan12125/libchewing,bbyykk/libtaigi,cwlin/libchewing,hiunnhue/libchewing,PeterDaveHello/libchewing,chewing/libchewing,Chocobo1/libchewing,bbyykk/libtaigi,robert501128/libchewing,yan12125/libchewing,PeterDaveHello/libchewing,cwlin/libchewing,hiunnhue/libchewing,PeterDaveHello/libchewing,robert501128/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,chewing/libchewing,cwlin/libchewing,ShengYenPeng/libchewing,chewing/libchewing,ShengYenPeng/libchewing,ShengYenPeng/libchewing,bbyykk/libtaigi,bbyykk/libtaigi,hiunnhue/libchewing