Replace "contagious" with "contiguous"
Replace "contagious" with "contiguous"

- Also fix a small typo in "necessary"

bitemyapp/write-you-a-haskell,bitemyapp/write-you-a-haskell,sdiehl/write-you-a-haskell,FranklinChen/write-you-a-haskell,mstksg/write-you-a-haskell,mstksg/write-you-a-haskell,FranklinChen/write-you-a-haskell,sisirkoppaka/write-you-a-haskell,sisirkoppaka/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell,sisirkoppaka/write-you-a-haskell,mstksg/write-you-a-haskell,mstksg/write-you-a-haskell,bitemyapp/write-you-a-haskell,sdiehl/write-you-a-haskell,sisirkoppaka/write-you-a-haskell,sisirkoppaka/write-you-a-haskell,bitemyapp/write-you-a-haskell,FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,bitemyapp/write-you-a-haskell,mstksg/write-you-a-haskell,yupferris/write-you-a-haskell,sdiehl/write-you-a-haskell,bitemyapp/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,sdiehl/write-you-a-haskell,sdiehl/write-you-a-haskell,yupferris/write-you-a-haskell