docs: update example to use correct button syntax

Author: gureckis

docs/coding/timeline.md

@@ -541,6 +541,7 @@ the `finish()` method):
 ```vue
 <script setup>
 import useAPI from '@/core/composables/useAPI'
+import { Button } from '@/uikit/components/ui/button'
 const api = useAPI()
 
 function finish(goto) {
@@ -551,9 +552,9 @@ function finish(goto) {
 <template>
   <div class="page">
     <h1 class="title is-3">Experiment</h1>
-    <button class="button is-success is-light" id="finish" @click="finish()">
+    <Button variant="success-light" @click="finish()">
       next &nbsp;<i-fa6-solid-arrow-right />
-    </button>
+    </Button>
   </div>
 </template>
 ```