/usr/share/lintian/overrides/postbooks-schema-common is in postbooks-schema-common 1:4.10.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # the INSTALL.txt file contains useful information about loading the schema
postbooks-schema-common binary: package-contains-upstream-install-documentation
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