/usr/share/lintian/overrides/gnash is in gnash 0.8.11~git20160109-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Missing manpages: usr/bin/gnash-gtk-launcher usr/bin/gnash-thumbnailer
gnash binary: binary-without-manpage
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