/usr/lib/ghc-doc/hoogle/libghc-hspec-attoparsec-doc.txt is in libghc-hspec-attoparsec-doc 0.1.0.2-3build7.
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It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hspec-attoparsec-doc/html/hspec-attoparsec.txt