Update README.md

Author: mythz

README.md

@@ -80,7 +80,7 @@ Run llms-py in a Docker container without installing Python or dependencies:
 docker pull ghcr.io/servicestack/llms:latest
 
 # Run the server on port 8000
-docker run -p 8000:8000 -e OPENROUTER_API_KEY=$OPENROUTER_API_KEY ghcr.io/servicestack/llms:latest
+docker run -p 8000:8000 -e GROQ_API_KEY=$GROQ_API_KEY ghcr.io/servicestack/llms:latest
 ```
 
 Or use docker-compose (recommended):