message: Fixing example run
diff: //
  // Parallel sample runs:
  // > mpirun -np 4 get-values -r ../electromagnetics/Volta-AMR-Parallel
  -// -p "0 0 0 0.1 0.1 0.1" -fn ALL
  +// -c 1 -p "0 0 0 0.1 0.1 0.1" -fn ALL
  //
  // Point locations can be specified on the command line using -p or within a
  // data file whose name can be given with option -pf. The data file format is:
  