Merge pull request #5685 from fangyi-zhou/fix-documentation-link

Fix some broken links (Trac #15733) [ci skip]

Author: 23Skidoo

Cabal/Distribution/Simple/GHC.hs

@@ -423,7 +423,7 @@ checkPackageDbStackPre76 verbosity rest
   | GlobalPackageDB `notElem` rest =
   die' verbosity $ "With current ghc versions the global package db is always used "
      ++ "and must be listed first. This ghc limitation is lifted in GHC 7.6,"
-     ++ "see http://hackage.haskell.org/trac/ghc/ticket/5977"
+     ++ "see http://ghc.haskell.org/trac/ghc/ticket/5977"
 checkPackageDbStackPre76 verbosity _ =
   die' verbosity $ "If the global package db is specified, it must be "
      ++ "specified first and cannot be specified multiple times"

Cabal/Distribution/Simple/GHCJS.hs

@@ -222,7 +222,7 @@ checkPackageDbStack verbosity rest
   | GlobalPackageDB `notElem` rest =
   die' verbosity $ "With current ghc versions the global package db is always used "
      ++ "and must be listed first. This ghc limitation may be lifted in "
-     ++ "future, see http://hackage.haskell.org/trac/ghc/ticket/5977"
+     ++ "future, see http://ghc.haskell.org/trac/ghc/ticket/5977"
 checkPackageDbStack verbosity _ =
   die' verbosity $ "If the global package db is specified, it must be "
      ++ "specified first and cannot be specified multiple times"