/usr/share/doc/libsylph-dev/README.gz is in libsylph-dev 1.1.0-15.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsylph-dev/../libsylph1/README.gz
/usr/share/doc/libsylph-dev/../libsylph1/README.gz