/usr/lib/libreoffice/sdk/docs is in libreoffice-dev-doc 1:3.5.7-0ubuntu13.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libreoffice/sdk/../../../share/doc/libreoffice-dev/docs
/usr/lib/libreoffice/sdk/../../../share/doc/libreoffice-dev/docs