/usr/share/doc/binutils-mipsisa64r6el-linux-gnuabi64-dbg is in binutils-mipsisa64r6el-linux-gnuabi64-dbg 2.30-15ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/binutils-mipsisa64r6el-linux-gnuabi64