/usr/share/doc/python3-os-api-ref/changelog.Debian.gz is in python3-os-api-ref 1.4.0-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python3-os-api-ref/../python-os-api-ref-common/changelog.Debian.gz