/usr/lib/ghc-doc/hoogle/semigroupoids.txt is in libghc-semigroupoids-doc 4.0-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-semigroupoids-doc/html/semigroupoids.txt