libchewing.texi: Fix format tweaks
libchewing.texi: Fix format tweaks

Signed-off-by: Jim Huang <b1c8ad271908ab342ec80ca4c319b7e9f508b5b3@gmail.com>

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