hdf5set_format_compatibility.c: Function docs.
hdf5set_format_compatibility.c: Function docs.

Comment change only.  Add one paragraph.  Explain the reason for the third argument to H5Pset_libver_bounds.  Simplifies experimental code using advanced features.
Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c