docs: old configure recommended for coupled build

[scrasmussen]

TYPE: text only

KEYWORDS: coupled, WRF + WRF-Hydro, build systems

SOURCE: Soren Rasmussen, NSF NCAR

DESCRIPTION OF CHANGES: Changing documentation from recommending CMake to Configure for the coupled case on Derecho

ISSUE: CMake has stopped working in the recent weeks for the coupled build. It returns an error when running ./real.exe

taskid: 0 hostname: derecho5
At line 2502 of file /path/to/testcases_wrf/frontrange_coupled/WRF/_build/external/io_netcdf/preproc/m4_preproc_wrf_io.f90
Fortran runtime error: End of record

Error termination. Backtrace:
#0  0x7fcbd9da5bd0 in write_character
        at /glade/derecho/scratch/csgteam/temp/spack/casper/24.12/builds/spack-stage-gcc-12.4.0-5b5cg6v66x5irfjbvi3o2nm6a4nid5ei/spack-src/libgfortran/io/write.c:1450
#1  0x7fcbd9daad8e in list_formatted_write_scalar
        at /glade/derecho/scratch/csgteam/temp/spack/casper/24.12/builds/spack-stage-gcc-12.4.0-5b5cg6v66x5irfjbvi3o2nm6a4nid5ei/spack-src/libgfortran/io/write.c:1944

TESTS CONDUCTED: Built documentation locally, warning section looks like the following