fix documentation typo. thanks to David K. Gasaway.
fix documentation typo. thanks to David K. Gasaway.

svn path=/trunk/vorbis/; revision=3963

eidy/vorbis,mwgoldsmith/vorbis,ShiftMediaProject/vorbis,mwgoldsmith/vorbis,eidy/vorbis,emscripten-ports/Vorbis,youfearm3/vorbis,felipebetancur/vorbis,emscripten-ports/Vorbis,felipebetancur/vorbis,felipebetancur/vorbis,erikd/vorbis,ksophocleous/vorbis,eidy/vorbis,ksophocleous/vorbis,ShiftMediaProject/vorbis,erikd/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,eidy/vorbis,ShiftMediaProject/vorbis,mwgoldsmith/vorbis,ksophocleous/vorbis,ShiftMediaProject/vorbis,erikd/vorbis,ksophocleous/vorbis,youfearm3/vorbis,erikd/vorbis,youfearm3/vorbis,nicolaichuk/vorbis,mwgoldsmith/vorbis,felipebetancur/vorbis,emscripten-ports/Vorbis,nicolaichuk/vorbis,emscripten-ports/Vorbis,nicolaichuk/vorbis,nicolaichuk/vorbis,youfearm3/vorbis