Fix gb Slurm typo (#68)

Author: simonpintarelli

docs/guides/gb2025.md

@@ -55,10 +55,10 @@ One consequence of this change is that thread affinity and OpenMP settings that
 
 ### SLURM
 
-Explicitly set the number of cores per task using the `--cores-per-task/-c` flag, e.g.:
+Explicitly set the number of cores per task using the `--cpus-per-task/-c` flag, e.g.:
 ```
-#SBATCH --cores-per-task=64
-#SBATCH --cores-per-task=71
+#SBATCH --cpus-per-task=64
+#SBATCH --cpus-per-task=71
 ```
 or
 ```