Fix bugs in Modules Tutorial (#9821)
Fix bugs in Modules Tutorial (#9821)

Found a couple bugs while trying to copy and paste the exact
tutorial content.
iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack