Chapter 6 Exercises code example doesn't follow C# syntax convention

[matthewcreek]

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Code examples:

   //TODO: can't have more gas than tank size, expect an exception
   [TestMethod]
   public void TestGasOverfillException() {

   }

   public void AddGas(double gas) {
     GasTankLevel += gas;
   }

Suggested change: using Allman style syntax the code should read:

   [TestMethod]
   public void TestGasOverfillException() 
    {

    }

   public void AddGas(double gas) 
   {
     GasTankLevel += gas;
   }