/usr/lib/ghc-doc/hoogle/data-lens.txt is in libghc-data-lens-doc 2.10.4-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-data-lens-doc/html/data-lens.txt