Update docs/software/communication/openmpi.md

Author: msimberg

docs/software/communication/openmpi.md

@@ -30,11 +30,10 @@ srun --mpi=pmix ...
 
 Additionally, the following environment variables should be set:
 ```bash
-export PMIX_MCA_psec="native" # (1)
-export FI_PROVIDER="cxi" # (2)
-export OMPI_MCA_pml="^ucx" # (3)
-export OMPI_MCA_mtl="ofi" # (4)
-```
+export PMIX_MCA_psec="native" # (1)!
+export FI_PROVIDER="cxi" # (2)!
+export OMPI_MCA_pml="^ucx" # (3)!
+export OMPI_MCA_mtl="ofi" # (4)!
 
 1. Ensures PMIx uses the same security domain as Slurm. Otherwise PMIx will print warnings at startup.
 2. Use the CXI (Slingshot) provider.