/usr/lib/ghc-doc/hoogle/libghc-readargs-doc.txt is in libghc-readargs-doc 1.2.2-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-readargs-doc/html/ReadArgs.txt