added code example

Author: corymharper

website/docs/design/options.md

@@ -10,4 +10,10 @@ Option | Default | Possible values
 
 Option | Explanation
 :--- | :---
-`disableFocusFirstItemOnClick` | If specified as `true` the default behavior of focusing the first menu item on click will be disabled. The menu button will instead retain focus.
+`disableFocusFirstItemOnClick` | If specified as `true` the default behavior of focusing the first menu item on click will be disabled. The menu button will instead retain focus.
+
+```js
+const { buttonProps, itemProps, isOpen, setIsOpen } = useDropdownMenu(numberOfItems, {
+    disableFocusFirstItemOnClick: true,
+});
+```