/usr/share/doc/gfortran-4.7-multilib-arm-linux-gnueabi is in gfortran-4.7-multilib-arm-linux-gnueabi 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-gnueabi-base