Update README.md

examples/multi_node_examples/README.md

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 # Multi-node example   
 
-To run this demo which launches a single job that trains on 2 nodes (2 gpus per node), do the following:
+This demo launches a job using 2 GPUs on 2 different nodes (4 GPUs total).
+To run this demo do the following:
 
 1. Log into the jumphost node of your SLURM-managed cluster.  
 2. Create a conda environment with Lightning and a GPU PyTorch version.