Fix typo in Color.cs

Change "reresentation" to "representation".

Author: ericmutta

src/AngleSharp.Css/Values/Primitives/Color.cs

@@ -210,7 +210,7 @@ public static Color FromHex(String color)
         /// Returns the color from the given hex string if it can be converted, otherwise
         /// the color is not set.
         /// </summary>
-        /// <param name="color">The hexadecimal reresentation of the color.</param>
+        /// <param name="color">The hexadecimal representation of the color.</param>
         /// <param name="value">The color value to be created.</param>
         /// <returns>The status if the string can be converted.</returns>
         public static Boolean TryFromHex(String color, out Color value)