Add missing closing parenthesis in code block on "Arrays and Lists" page (#5066)

Summary:
Add missing closing parenthesis.

Pull Request resolved: #5066

Reviewed By: tyao1

Differential Revision: D81799083

Pulled By: evanyeung

fbshipit-source-id: 5bf0e422501f187b7f997bbcc5da39eb16d9ab00

Author: DrDabbidy

website/docs/tutorial/arrays-lists.md

@@ -111,7 +111,7 @@ export default function Newsfeed({}) {
           key={story.id}
           story={story}
         />
-      )}
+      ))}
     </div>
   );
 }

website/versioned_docs/version-v20.1.0/tutorial/arrays-lists.md

@@ -111,7 +111,7 @@ export default function Newsfeed({}) {
           key={story.id}
           story={story}
         />
-      )}
+      ))}
     </div>
   );
 }