Fix incorrect link address

Author: Sasha

1-js/09-classes/04-private-protected-properties-methods/article.md

@@ -279,7 +279,7 @@ With private fields that's impossible: `this['#name']` doesn't work. That's a sy
 
 ## Summary
 
-In terms of OOP, delimiting of the internal interface from the external one is called [encapsulation]("https://en.wikipedia.org/wiki/Encapsulation_(computer_programming)").
+In terms of OOP, delimiting of the internal interface from the external one is called [encapsulation](https://en.wikipedia.org/wiki/Encapsulation_(computer_programming)).
 
 It gives the following benefits: