/usr/lib/ghc-doc/hoogle/libghc-reform-doc.txt is in libghc-reform-doc 0.2.7.1-3build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-reform-doc/html/reform.txt