/usr/share/doc/libsasl2-modules-ldap/changelog.Debian.gz is in libsasl2-modules-ldap 2.1.25.dfsg1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsasl2-modules-ldap/../libsasl2-2/changelog.Debian.gz