Added a few doxygen comments to hashbits.cc
Added a few doxygen comments to hashbits.cc

souravsingh/khmer,Winterflower/khmer,jas14/khmer,jas14/khmer,kdmurray91/khmer,F1000Research/khmer,ged-lab/khmer,souravsingh/khmer,kdmurray91/khmer,kdmurray91/khmer,Winterflower/khmer,souravsingh/khmer,F1000Research/khmer,ged-lab/khmer,Winterflower/khmer,ged-lab/khmer,F1000Research/khmer,jas14/khmer