/usr/share/doc/gccgo-7-arm-linux-gnueabi is in gccgo-7-arm-linux-gnueabi 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gcc-7-arm-linux-gnueabi-base
/usr/share/doc/gcc-7-arm-linux-gnueabi-base