Update NormalizeColumnSng.cs

Author: michaelgsharp

src/Microsoft.ML.Data/Transforms/NormalizeColumnSng.cs

@@ -452,12 +452,12 @@ public Double[] MeanSquareError
         {
             get { return _m2.Select((m2, i) => m2 / _cnz[i]).ToArray(); }
         }
+
         public Double[] SampleVariance
         {
             get { return _m2.Select((m2, i) => m2 / Math.Max(0, _cnz[i] - 1)).ToArray(); }
         }
 
-
         public Double[] M2
         {
             get { return _m2; }