Add missing API and tweak some description
Add missing API and tweak some description

bbyykk/libtaigi,Chocobo1/libchewing,mangokingTW/libchewing,czchen/libchewing,bbyykk/libtaigi,simonfork/libchewing,cwlin/libchewing,cwlin/libchewing,chewing/libchewing,dimotsai/libchewing,dimotsai/libchewing,cwlin/libchewing,czchen/libchewing,PeterDaveHello/libchewing,chewing/libchewing,simonfork/libchewing,kito-cheng/libchewing,ShengYenPeng/libchewing,simonfork/libchewing,dimotsai/libchewing,robert501128/libchewing,kito-cheng/libchewing,robert501128/libchewing,hiunnhue/libchewing,chewing/libchewing,ShengYenPeng/libchewing,robert501128/libchewing,cwlin/libchewing,yan12125/libchewing,PingNote/libchewing,Chocobo1/libchewing,mangokingTW/libchewing,yan12125/libchewing,Chocobo1/libchewing,PeterDaveHello/libchewing,robert501128/libchewing,dimotsai/libchewing,mangokingTW/libchewing,hiunnhue/libchewing,mangokingTW/libchewing,PingNote/libchewing,PeterDaveHello/libchewing,hiunnhue/libchewing,Chocobo1/libchewing,PingNote/libchewing,kito-cheng/libchewing,ShengYenPeng/libchewing,PingNote/libchewing,bbyykk/libtaigi,hiunnhue/libchewing,ShengYenPeng/libchewing,cwlin/libchewing,chewing/libchewing,kito-cheng/libchewing,Chocobo1/libchewing,bbyykk/libtaigi,PeterDaveHello/libchewing,yan12125/libchewing,bbyykk/libtaigi,simonfork/libchewing,czchen/libchewing,czchen/libchewing,yan12125/libchewing,hiunnhue/libchewing