/usr/share/lintian/overrides/rng-tools is in rng-tools 2-unofficial-mt.14-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | rng-tools: description-synopsis-starts-with-a-capital-letter
rng-tools: command-with-path-in-maintainer-script
|