/usr/share/lintian/overrides/dpkg-sig is in dpkg-sig 0.13.1+nmu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | dpkg-sig: zero-byte-file-in-doc-directory usr/share/doc/dpkg-sig/examples/sample/debian/tmp/tmp/test
dpkg-sig: zero-byte-file-in-doc-directory usr/share/doc/dpkg-sig/examples/sample/test
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