/usr/lib/ghc-doc/hoogle/libghc-monadcatchio-mtl-doc.txt is in libghc-monadcatchio-mtl-doc 0.3.1.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-monadcatchio-mtl-doc/html/MonadCatchIO-mtl.txt