revise doc comment for resample
revise doc comment for resample

We can now do high-quality reduce for any scale factor, though it'll be
slow for very large reductions.

Thanks homm, see https://github.com/libvips/pyvips/issues/148

jcupitt/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips