/usr/share/doc/gobjc-8-multilib-i686-linux-gnu is in gobjc-8-multilib-i686-linux-gnu 8-20180414-1ubuntu2cross1.
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It is a symlink to /usr/share/doc/gcc-8-i686-linux-gnu-base
/usr/share/doc/gcc-8-i686-linux-gnu-base