nonsense warning from texinfo while processing intrinsic.texi

[Steve Kargl]

I added some documentation to fortran/intrinsic.texi.  In
processing the gfortran.f90, I discovered this warning.

  makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000 \
  -I ../../gcc/gcc/doc/include -I ../../gcc/gcc/fortran \
    -o doc/gfortran.info ../../gcc/gcc/fortran/gfortran.texi; \
else true; fi
../../gcc/gcc/fortran/gfortran.texi:2701: warning: @ref node name should
 not contain `:'

Line 2701 is 

@fnindex DBESYN

not only is there no ':', there is no @ref.

What to do?

-- 
Steve