/usr/share/doc/libio-stringy-perl/html/index.html is in libio-stringy-perl 2.110-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libio-stringy-perl/html/Stringy.pm.html
/usr/share/doc/libio-stringy-perl/html/Stringy.pm.html