add console-address flag for spoonfed users

docs/gateway/s3.md

@@ -7,10 +7,13 @@ As a prerequisite to run MinIO S3 gateway, you need valid AWS S3 access key and
 
 ### Using Docker
 ```
-podman run -p 9000:9000 --name minio-s3 \
+podman run \
+ -p 9000:9000 \
+ -p 9001:9001 \
+ --name minio-s3 \
  -e "MINIO_ROOT_USER=aws_s3_access_key" \
  -e "MINIO_ROOT_PASSWORD=aws_s3_secret_key" \
- minio/minio gateway s3
+ minio/minio gateway s3 --console-address ":9001"
 ```
 
 ### Using Binary