Make sure Image::ThreadedLoop appears in a more obvious place in the doc
Make sure Image::ThreadedLoop appears in a more obvious place in the doc

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3