/usr/lib/ghc-doc/hoogle/libghc-persistent-template-doc.txt is in libghc-persistent-template-doc 2.5.1.6-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-persistent-template-doc/html/persistent-template.txt