Update article.md

Maybe it is "Object.defineProperty()" rather than "defineProperty()"

Author: LitStronger

1-js/07-object-properties/01-property-descriptors/article.md

@@ -243,7 +243,7 @@ Object.defineProperty(user, "name", {
 // all this won't work:
 //   user.name = "Pete"
 //   delete user.name
-//   defineProperty(user, "name", { value: "Pete" })
+//   Object.defineProperty(user, "name", { value: "Pete" })
 Object.defineProperty(user, "name", {writable: true}); // Error
 */!*
 ```