Added a few hints in the documentation

Author: mvhulten

docs/users_guide/1_create_grid_file.md

@@ -27,6 +27,7 @@ The python script `mkscrip_rect.py` can create SCRIP files including the calcula
 It takes command line arguments like this:
 
 ```
+cd mkmapgrids/
 ./mkscrip_rect.py --ifile EUR-regLonLat01deg_1204x548_grid_inclbrz_v2.nc --ofile EUR-regLonLat01deg_659792_grid_SCRIP.nc --oformat SCRIP
 ```
 
@@ -87,6 +88,7 @@ Check out https://zonda.ethz.ch/ for generating icosahedral input grids for `mks
 Then convert your ICON gridfile to the SCRIP format with the python script `mkscrip_icos.py`:
 
 ```
+cd mkmapgrids/
 ./mkscrip_icos.py --ifile EUR-R13B05_199920_grid_inclbrz_v2.nc --ofile EUR-R13B05_199920_grid_SCRIP.nc
 ```
 

docs/users_guide/3_create_domain_file.md

@@ -12,6 +12,7 @@ gfortran -o gen_domain src/gen_domain.F90 -mkl -I${INC_NETCDF} -lnetcdff -lnetcd
 If the Intel Math Kernel Library (MKL) is not available on your system, you can remove the `-mkl` flag without consequences for the output.
 After the compilation you can execute `gen_domain` with $MAPFILE being one of the mapping files created in the step before (in `mkmapdata/`) and $GRIDNAME being a string with the name of your grid, e.g. `EUR-R13B05` for the ~12-km icosahedral grid.
 The choice of $MAPFILE does not influence the lat- and longitude values in the domain file but can influence the land/sea mask.
+If you use the `EUR-R13B05` grid, you could set `MAPFILE="../mkmapdata/map_0.5x0.5_AVHRR_to_${GRIDNAME}_*_c${CDATE}.nc"`.
 
 **Hint:** For better reproducibility, specify the absolute path of
 `$MAPFILE`. The absolute path to the file can be printed using