/usr/lib/ghc-doc/hoogle/libghc-microlens-doc.txt is in libghc-microlens-doc 0.4.8.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-microlens-doc/html/microlens.txt