/usr/lib/ghc-doc/hoogle/libghc-dimensional-doc.txt is in libghc-dimensional-doc 1.0.1.3-3build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-dimensional-doc/html/dimensional.txt