/usr/share/doc/libobjc2-armel-cross is in libobjc2-armel-cross 4.5.3-12ubuntu2cross1.61.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gcc-4.5-arm-linux-gnueabi-base
/usr/share/doc/gcc-4.5-arm-linux-gnueabi-base