/usr/lib/ghc-doc/hoogle/libghc-statevar-doc.txt is in libghc-statevar-doc 1.1.0.4-4build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-statevar-doc/html/StateVar.txt