/usr/lib/ghc-doc/hoogle/libghc-finite-field-doc.txt is in libghc-finite-field-doc 0.8.0-3build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-finite-field-doc/html/finite-field.txt