/usr/share/doc/g++-4.7-multilib-arm-linux-gnueabihf is in g++-4.7-multilib-arm-linux-gnueabihf 4.7.4-3ubuntu12cross3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gcc-4.7-arm-linux-gnueabihf-base