hdf5doc

Description:
    H5Rget_obj_type1
    H5Rget_obj_type2
        Added text to clarify distinction between "reference type" and 
            "referenced object type."
        Specified that H5Dget_type is called on the dataset containing the 
            reference.
        Addresses some issues of Bugzilla entry 216.
    h5rget_obj_type_f
        Moved subroutine description from H5Rget_obj_type1 function 
            description to H5Rget_obj_type macro description, linking 
            to that subroutine description from H5Rget_obj_type1 and 
            H5Rget_obj_type2. 
    HTML cleanup and minor formatting and copy edits.
Tested: Firefox