/usr/lib/ghc-doc/hoogle/libghc-cmark-doc.txt is in libghc-cmark-doc 0.5.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-cmark-doc/html/cmark.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-cmark-doc/html/cmark.txt