Update MDN link to point to general OOP page vs. page on JS classes. (exercism#2529)

Author: ang-bet

exercises/concept/high-score-board/.docs/introduction.md

@@ -143,7 +143,7 @@ for (let key in obj) {
 To avoid subtle errors, you should always assume the `for...in` loop visits the keys in an arbitrary order.
 Also, be aware that `for...in` includes [inherited keys][concept-inheritance] in its iteration.
 
-[oop]: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_JS
+[oop]: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_programming
 [concept-classes]: /tracks/javascript/concepts/classes
 [mdn-identifier]: https://developer.mozilla.org/en-US/docs/Glossary/Identifier
 [concept-inheritance]: /tracks/javascript/concepts/inheritance