/usr/lib/ghc-doc/hoogle/setenv.txt is in libghc-setenv-doc 0.1.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-setenv-doc/html/setenv.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-setenv-doc/html/setenv.txt