/usr/lib/ghc-doc/hoogle/ansi-wl-pprint.txt is in libghc-ansi-wl-pprint-doc 0.6.7.1-1.
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It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-ansi-wl-pprint-doc/html/ansi-wl-pprint.txt