/usr/lib/ghc-doc/hoogle/fastcgi.txt is in libghc-fastcgi-doc 3001.0.2.4-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-fastcgi-doc/html/fastcgi.txt