Update README.md

Author: JBris

README.md

@@ -19,7 +19,7 @@ Run `docker compose up -d` to launch a local SLURM cluster.
 
 Within the *c2* node, set the JSON web token: `export $(docker compose exec c2 scontrol token)`
 
-Test that you can access the SLURM API: `curl -k -vvvv -H X-SLURM-USER-TOKEN:$SLURM_JWT -H X-SLURM-USER-NAME:root -X GET 'http://localhost:9200/openapi/v3' > docs.json`
+Test that you can access the SLURM API documentation: `curl -k -vvvv -H X-SLURM-USER-TOKEN:${SLURM_JWT} -H X-SLURM-USER-NAME:root -X GET 'http://localhost:9200/openapi/v3' > docs.json`
 
 Submit a SLURM job: `curl -X POST "http://localhost:9200/slurm/v0.0.37/job/submit" -H "X-SLURM-USER-NAME:root" -H "X-SLURM-USER-TOKEN:${SLURM_JWT}" -H "Content-Type: application/json" -d @rest_api_test.json`