GHC 6.0 false download link

https://www.haskell.org/ghc/download_ghc_600.html says download ghc-6.0-src.tar.bz2 from https://downloads.haskell.org/~ghc/6/ghc-6.0-src.tar.bz2 but should state https://downloads.haskell.org/~ghc/6.0/ghc-6.0-src.tar.bz2 : note .0 in the URL after the first six.

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