/usr/lib/ghc-doc/hoogle/libghc-language-haskell-extract-doc.txt is in libghc-language-haskell-extract-doc 0.2.4-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-language-haskell-extract-doc/html/language-haskell-extract.txt