Include stringification of iterable in example

Possible now #419 is fixed.

Author: ExE-Boss

index.bs

@@ -4233,8 +4233,7 @@ that have [=members=] with these names.
 
         typeof SessionManager.prototype.values;            // Evaluates to "function"
         var it = sm.values();                              // values() returns an iterator object
-<!--    String(it);                                        // Evaluates to "[object SessionManager Iterator]"
-                                                           // TODO: https://github.com/heycam/webidl/issues/419 -->
+        String(it);                                        // Evaluates to "[object SessionManager Iterator]"
         typeof it.next;                                    // Evaluates to "function"
 
         // This loop will log "anna" and then "brian".