/usr/share/doc/openjdk-11-jdk-headless is in openjdk-11-jdk-headless 10.0.1+10-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/openjdk-11-jre-headless
/usr/share/doc/openjdk-11-jre-headless