Add comment to scrollTo function

Author: freddydumont

src/index.js

@@ -1,3 +1,7 @@
+/**
+ * Smooth scrolling onClick event handler
+ * @param {string} selector argument will be passed to `querySelector`, usually an HTML id
+ */
 const scrollTo = (selector) => {
   document.querySelector(selector).scrollIntoView({
     behavior: 'smooth',