/usr/lib/ghc-doc/hoogle/haskelldb-hdbc-odbc.txt is in libghc-haskelldb-hdbc-odbc-doc 2.1.2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-haskelldb-hdbc-odbc-doc/html/haskelldb-hdbc-odbc.txt