docs(web): JSDoc comments for svelte actions (#12963)

* Web: JSDoc comments for Actions

* Remove comment

web/src/lib/actions/list-navigation.ts

@@ -1,6 +1,11 @@
 import { shortcuts } from '$lib/actions/shortcut';
 import type { Action } from 'svelte/action';
 
+/**
+ * Enables keyboard navigation (up and down arrows) for a list of elements.
+ * @param node Element which listens for keyboard events
+ * @param container Element containing the list of elements
+ */
 export const listNavigation: Action<HTMLElement, HTMLElement> = (node, container: HTMLElement) => {
   const moveFocus = (direction: 'up' | 'down') => {
     const children = Array.from(container?.children);