/usr/lib/ghc-doc/hoogle/libghc-csv-conduit-doc.txt is in libghc-csv-conduit-doc 0.6.6-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-csv-conduit-doc/html/csv-conduit.txt