/usr/lib/ghc-doc/hoogle/libghc-http-link-header-doc.txt is in libghc-http-link-header-doc 1.0.3-4build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-http-link-header-doc/html/http-link-header.txt