Update storage.js

Author: notriddle

src/librustdoc/html/static/js/storage.js

@@ -103,7 +103,7 @@ function onEach(arr, func) {
  * https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection
  * https://developer.mozilla.org/en-US/docs/Web/API/NodeList
  * @param {NodeList|HTMLCollection} lazyArray  - An array to iterate over
- * @param {function(?): boolean|undefined|void}    func       - The callback
+ * @param {function(?): boolean|void}    func       - The callback
  */
 // eslint-disable-next-line no-unused-vars
 function onEachLazy(lazyArray, func) {