HFVHANDLER-191, add/edit comments for the handling of genenral HDF5 products.
HFVHANDLER-191, add/edit comments for the handling of genenral HDF5 products.

OPENDAP/hdf5_handler,OPENDAP/hdf5_handler,OPENDAP/hdf5_handler,OPENDAP/hdf5_handler,OPENDAP/hdf5_handler,OPENDAP/hdf5_handler