Docs: add missing open attribute to first Accordion example

Author: julien-deramond

site/src/content/docs/components/accordion.mdx

@@ -17,7 +17,7 @@ Click the accordions below to expand/collapse the accordion content. Each `<deta
 To render an accordion that's expanded by default, add the `open` attribute to the `<details>` element.
 
 <Example code={`<div class="accordion">
-    <details class="accordion-item" name="accordionExample">
+    <details class="accordion-item" name="accordionExample" open>
       <summary class="accordion-header">
         Accordion Item #1
         <svg class="accordion-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"><path d="m2 5 6 6 6-6"/></svg>