Existing docs appear to be missing a hyphen, causing a syntax error for users. `docker run -p 9090:9090 -v "$(pwd)/prometheus-data":/prometheus-data prom/prometheus -config.file=/prometheus-data/prometheus.yml` Should be: `docker run -p 9090:9090 -v "$(pwd)/prometheus-data":/prometheus-data prom/prometheus --config.file=/prometheus-data/prometheus.yml`