/usr/lib/ghc-doc/hoogle/libghc-half-doc.txt is in libghc-half-doc 0.2.2.3-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-half-doc/html/half.txt