/usr/lib/ghc-doc/hoogle/hslogger.txt is in libghc-hslogger-doc 1.2.1+dfsg1-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hslogger-doc/html/hslogger.txt