Update getting-started.mdx (#2402)

Co-authored-by: William Bergamin <wbergamin@salesforce.com>

docs/content/getting-started.mdx

@@ -475,7 +475,7 @@ app.action('button_click', async ({ body, ack, say }) => {
   </TabItem>
 </Tabs>
 
-You can see that we used `app.action()` to listen for the `action_id` that we named `sample_button`. If you restart your app and click the button, you'll see a new message from your app that says you clicked the button.
+You can see that we used `app.action()` to listen for the `action_id` that we named `button_click`. If you restart your app and click the button, you'll see a new message from your app that says you clicked the button.
 
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