add Fortran H5ES reference to RM table (#4908)

doxygen/dox/ReferenceManual.dox

@@ -31,7 +31,7 @@ The functions provided by the HDF5 API are grouped into the following
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-<th>Event Set (H5ES)</th><td>@ref H5ES "C"</td><td>"C++"</td><td>"Fortran"</td><td>"Java"</td><td>HDF5 event set life cycle used with HDF5 VOL connectors that enable the asynchronous feature in HDF5.
+<th>Event Set (H5ES)</th><td>@ref H5ES "C"</td><td>"C++"</td><td>@ref FH5ES "Fortran"</td><td>"Java"</td><td>HDF5 event set life cycle used with HDF5 VOL connectors that enable the asynchronous feature in HDF5.
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