add summary to AutoToString

src/Debug/EcsDebugUtility.cs

@@ -40,6 +40,7 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region AutoToString
+        /// <summary> slow but automatic conversion of ValueType to string in the format "name(field1, field2... fieldn)" </summary>
         public static string AutoToString<T>(this T self, bool isWriteName = true) where T : struct
         {
             return AutoToString(self, typeof(T), isWriteName);