chore: update mpirun commands

Author: timurbazhirov

lang/en/docs/jobs-cli/batch-scripts/sample-scripts.md

@@ -23,7 +23,8 @@ This example requests 1 node with 2 processors (cores) for 10 minutes, in the De
 
 cd $PBS_O_WORKDIR
 module load espresso
-mpirun -np $PBS_NP pw.x -in pw.input
+# $EXEC_CMD is set by the environment module
+mpirun -np $PBS_NP $EXEC_CMD pw.x -in pw.input
 ```
 
 ## On-demand regular (OR)
@@ -44,5 +45,6 @@ This example requests 1 node and 16 cores for 10 minutes, on the OR [queue](../.
 
 cd $PBS_O_WORKDIR
 module load vasp
-mpirun -np $PBS_NP vasp
+# $EXEC_CMD is set by the environment module
+mpirun -np $PBS_NP $EXEC_CMD vasp
 ```

lang/en/docs/tutorials/jobs-cli/job-cli-example.md

@@ -112,7 +112,8 @@ Secondly, we prepare the [Batch Script](../../jobs-cli/batch-scripts/overview.md
 
 module add espresso
 cd $PBS_O_WORKDIR
-mpirun -np $PBS_NP pw.x -in pw.in > pw.out
+# $EXEC_CMD is set by the environment module
+mpirun -np $PBS_NP $EXEC_CMD pw.x -in pw.in > pw.out
 ```
 
 Just like before, we are using template variables again instead of the [project](../../jobs/projects.md) name and email. Variables starting with `$PBS` are automatically set by the [resource manager](../../infrastructure/resource/overview.md), and are known as the ["PBS Directives"](../../jobs-cli/batch-scripts/directives.md). 
@@ -258,7 +259,7 @@ EOF
 
 module add espresso
 cd \$PBS_O_WORKDIR
-mpirun -np \$PBS_NP pw.x -in srzro3_${celldm1}.in | tee srzro3_${celldm1}.out
+mpirun -np \$PBS_NP $EXEC_CMD pw.x -in srzro3_${celldm1}.in | tee srzro3_${celldm1}.out
 EOF
     qsub run_QE_${celldm1}.pbs
 done

lang/en/docs/tutorials/jobs-cli/qe-gpu.md

@@ -41,7 +41,7 @@ with 8 OpenMP threads.
 ```bash
 module load espresso/7.4-cuda-12.4-cc-70
 export OMP_NUM_THREADS=8
-mpirun -np 1 pw.x -npool 1 -ndiag 1 -in pw.cuo.scf.in > pw.cuo.gpu.scf.out
+mpirun -np 1 $EXEC_CMD pw.x -npool 1 -ndiag 1 -in pw.cuo.scf.in > pw.cuo.gpu.scf.out
 ```
 
 6. Finally, we can submit our job using: