Add comment to labelledArray types (#13007)

Author: jgrosseo

Framework/Core/include/Framework/Variant.h

@@ -41,16 +41,16 @@ enum class VariantType : int { Int = 0,
                                Array2DInt,
                                Array2DFloat,
                                Array2DDouble,
-                               LabeledArrayInt,
-                               LabeledArrayFloat,
-                               LabeledArrayDouble,
+                               LabeledArrayInt,    // 2D array
+                               LabeledArrayFloat,  // 2D array
+                               LabeledArrayDouble, // 2D array
                                UInt8,
                                UInt16,
                                UInt32,
                                UInt64,
                                Int8,
                                Int16,
-                               LabeledArrayString,
+                               LabeledArrayString, // 2D array
                                Empty,
                                Dict,
                                Unknown };