/usr/lib/ghc-doc/hoogle/libghc-yesod-auth-hashdb-doc.txt is in libghc-yesod-auth-hashdb-doc 1.6.2-1build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-yesod-auth-hashdb-doc/html/yesod-auth-hashdb.txt