/usr/share/doc/libgo4-ppc64el-cross is in libgo4-ppc64el-cross 4.8.5-4ubuntu1cross2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gcc-4.8-powerpc64le-linux-gnu-base
/usr/share/doc/gcc-4.8-powerpc64le-linux-gnu-base