/usr/lib/ghc-doc/hoogle/pem.txt is in libghc-pem-doc 0.2.1-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-pem-doc/html/pem.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-pem-doc/html/pem.txt