/usr/share/lintian/overrides/libgtkspellmm-3.0-doc is in libgtkspellmm-3.0-doc 3.0.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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libgtkspellmm-3.0-doc: duplicate-files usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2mlastnode.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2mnode.png
libgtkspellmm-3.0-doc: duplicate-files usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2plastnode.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2pnode.png
libgtkspellmm-3.0-doc: duplicate-files usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2doc.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2link.png
libgtkspellmm-3.0-doc: duplicate-files usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2blank.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2lastnode.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2node.png usr/share/doc/libgtkspellmm-3.0-doc/reference/html/ftv2vertline.png
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