/usr/lib/ghc-doc/hoogle/libghc-yesod-doc.txt is in libghc-yesod-doc 1.4.5-1build7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-yesod-doc/html/yesod.txt