/usr/lib/erlang/erts-5.8.5/doc is in erlang-doc 1:14.b.4-dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/erlang/erts-5.8.5/../../../share/doc/erlang-doc/erts-5.8.5/doc
/usr/lib/erlang/erts-5.8.5/../../../share/doc/erlang-doc/erts-5.8.5/doc