/usr/lib/ghc-doc/hoogle/warp.txt is in libghc-warp-doc 1.3.9-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-warp-doc/html/warp.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-warp-doc/html/warp.txt