Fix charset: utf8 -> utf-8 and add a lacked </span> at "backend_socket_dir".
Fix charset: utf8 -> utf-8 and add a lacked </span> at "backend_socket_dir".

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres