Fix code comment to print the correct value

Author: MarounMaroun

_tour/classes.md

@@ -42,7 +42,7 @@ class Point(var x: Int, var y: Int) {
 
 val point1 = new Point(2, 3)
 point1.x  // 2
-println(point1)  // prints (x, y)
+println(point1)  // prints (2, 3)
 ```
 
 This `Point` class has four members: the variables `x` and `y` and the methods `move` and