hdf5doc

Description:
    H5Fis_hdf5:  Revised "Returns:" section to make it clear that the 
        function returns a negative value if the file does not exist.
        -- Closes Bugzilla #1057.
    H5Fget_vfd_handle:  Corrected 'file_handle' parameter syntax.
        -- Closes Bugzilla #1314.
Tested: Firefox