[Docs]: Render toast on page load (#363)

* [Docs]: Add render toast on page load

* fix typo

Author: luis-viegas

website/src/pages/toast.mdx

@@ -27,6 +27,16 @@ toast('My toast', {
 });
 ```
 
+### Render toast on page load
+
+To render a toast on initial page load it is required that the function `toast()` is called inside of a `setTimeout` or `requestAnimationFrame`.
+
+```jsx
+setTimeout(() => {
+  toast('My toast on a page load');
+})
+```
+
 ## Creating toasts
 
 ### Success