/usr/share/man/man1/mysql_config.1.gz is in libmariadb-dev-compat 2.3.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/mariadb_config.1.gz
/usr/share/man/man1/mariadb_config.1.gz