/usr/lib/ghc-doc/hoogle/Agda.txt is in libghc-agda-doc 2.3.2.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-agda-doc/html/Agda.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-agda-doc/html/Agda.txt