Solution use-the-parseint-function-with-a-radix.english.md (#18746)

* Update use-the-parseint-function-with-a-radix.english.md

* Improved JavaScript formatting

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix.english.md

@@ -62,6 +62,8 @@ convertToInteger("10011");
 <section id='solution'>
 
 ```js
-// solution required
+function convertToInteger(str) {
+  return parseInt(str, 2);
+}
 ```
 </section>