Update exercise-instructions.md

exercise-instructions.md

@@ -304,15 +304,15 @@ srun --job-name=example --account=project_465001194 --partition=small --reservat
 
 When running GPU programs, few changes need to made to the batch job
 script. The `partition` is are now different, and one must also request explicitly given number of GPUs per node with the
-`--gpus-per-node=8` option. As an example, in order to use a
+`--gpus-per-node=X` option. As an example, in order to use a
 single GPU with single MPI task and a single thread use:
 ```
 #!/bin/bash
 #SBATCH --job-name=example
 #SBATCH --account=project_465001194
 #SBATCH --partition=small-g
 #SBATCH --reservation=CSC_summer_school_gpu
-#SBATCH --gpus-per-node=8
+#SBATCH --gpus-per-node=1
 #SBATCH --nodes=1
 #SBATCH --ntasks=1
 #SBATCH --time=00:05:00