/usr/lib/ghc-doc/hoogle/lens.txt is in libghc-lens-doc 3.10-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-lens-doc/html/lens.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-lens-doc/html/lens.txt