/usr/lib/ghc-doc/hoogle/wai-handler-fastcgi.txt is in libghc-wai-handler-fastcgi-doc 3.0.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-wai-handler-fastcgi-doc/html/wai-handler-fastcgi.txt