itselfs -> itself

Author: dragonwocky

1-js/09-classes/05-private-protected-properties-methods/article.md

@@ -257,7 +257,7 @@ machine.waterAmount = 100;
 alert(machine.#waterAmount); // Error
 ```
 
-Unlike protected ones, private fields are enforced by the language itselfs. That's a good thing.
+Unlike protected ones, private fields are enforced by the language itself. That's a good thing.
 
 But if we inherit from `CoffeeMachine`, then we'll have no direct access to `#waterAmount`. We'll need to rely on `waterAmount` getter/setter: