/usr/share/doc/binutils-mipsisa64r6el-linux-gnuabin32/gas is in binutils-mipsisa64r6el-linux-gnuabin32 2.30-15ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/binutils-mipsisa64r6el-linux-gnuabin32/../binutils/gas