GUACAMOLE-42: Merge documentation for Docker GUACD_LOG_LEVEL environment variable.
GUACAMOLE-42: Merge documentation for Docker GUACD_LOG_LEVEL environment variable.

mike-jumper/incubator-guacamole-manual,mike-jumper/incubator-guacamole-manual,mike-jumper/incubator-guacamole-manual