Cite MPI-4.1 as reference for mpif.h deprecation

Co-authored-by: Jeff Squyres <[email protected]>
Signed-off-by: Joseph Schuchart <[email protected]>

Author: devreal

Diff for: config/ompi_setup_mpi_fortran.m4

@@ -385,7 +385,7 @@ end program]])],
     AS_IF([test "x$enable_deprecate_mpif_h" = "xyes" && test "$OMPI_FORTRAN_SUPPORTS_WARNING" = "no"],
           [AC_MSG_ERROR([Request to mark mpif.h as deprecated but Fortran compiler does not support warning preprocessor directive.])])
     AS_IF([test "x$enable_deprecate_mpif_h" != "xno" && test "$OMPI_FORTRAN_SUPPORTS_WARNING" = "yes"],
-            [OMPI_FORTRAN_DEPRECATE_MPIF_H="#warning mpif.h is deprecated since MPI 4.1. Refer to MPI Sec. 19.1.4."
+            [OMPI_FORTRAN_DEPRECATE_MPIF_H="#warning mpif.h has been deprecated since MPI 4.1. See MPI-4.1:19.1.4 for details."
              AC_MSG_RESULT([yes])],
             [OMPI_FORTRAN_DEPRECATE_MPIF_H=""
              AC_MSG_RESULT([no])])