Added track kind

This should be there. <track kind="captions"> To avoid the following error A11y: Media elements must have a <track kind="captions"> (111:1)

site/content/tutorial/06-bindings/10-media-elements/app-a/App.svelte

@@ -113,7 +113,9 @@
 		src="https://sveltejs.github.io/assets/caminandes-llamigos.mp4"
 		on:mousemove={handleMousemove}
 		on:mousedown={handleMousedown}
-	></video>
+	>
+	<track kind="captions">
+	</video>
 
 	<div class="controls" style="opacity: {duration && showControls ? 1 : 0}">
 		<progress value="{(time / duration) || 0}"/>