Fix typo

src/Avalonia.Controls/SizeChangedEventArgs.cs

@@ -79,7 +79,7 @@ namespace Avalonia.Controls
         /// </summary>
         /// <remarks>
         /// This will take into account layout epsilon and will not be true if both
-        /// heights are considered equivalent for layout purposes. Remember there can
+        /// widths are considered equivalent for layout purposes. Remember there can
         /// be small variations in the calculations between layout cycles due to
         /// rounding and precision even when the size has not otherwise changed.
         /// </remarks>