Update README.md

hasher-matcher-actioner/README.md

@@ -63,7 +63,7 @@ For production environments, it is recommended to use a more robust server like
 
 Here is an example command to run the application with Gunicorn:
 
-```
+```bash
 $ docker run -e OMM_CONFIG='/build/reference_omm_configs/production_omm_config.py' -p 5000:5000 ghcr.io/facebook/threatexchange/hma gunicorn --bind 0.0.0.0:5000 "OpenMediaMatch.app:create_app()"
 ```