📝 Update docker.mdx (#1597)

Fixed typo in MinIO volume mapping "s3-data" in docker compose file

apps/docs/self-hosting/deploy/docker.mdx

@@ -308,7 +308,7 @@ services:
       MINIO_ROOT_USER: minio
       MINIO_ROOT_PASSWORD: minio123
     volumes:
-      - s3_data:/data
+      - s3-data:/data
   # This service just make sure a bucket with the right policies is created
   createbuckets:
     image: minio/mc