/usr/lib/ghc-doc/hoogle/libghc-libmpd-doc.txt is in libghc-libmpd-doc 0.9.0.7-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-libmpd-doc/html/libmpd.txt