Remove a misleading comment about VBR quality request range.
Remove a misleading comment about VBR quality request range.

The documentation says the range is -0.1 to 1.0, but these comments
started the range at 0.0. Against expectations, it looks like the
documentation is correct.

Patch from Douglas Bagnall <douglas@paradise.net.nz>.

svn path=/trunk/vorbis/; revision=16790

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