Component subcomponent page

Documentation/docusaurus/docs/razor-component/complex-component-item.md

@@ -96,7 +96,7 @@ public partial class CraftingItem
 
 It is also possible to create CSS style files directly for our component, this file will be automatically rendered with our component.
 
-```css title="Components/CraftingItem.razor.cs"
+```css title="Components/CraftingItem.razor.css"
 .item {
     width: 64px;
     height: 64px;
@@ -130,9 +130,11 @@ The following code:
         New title
         <input @bind="newHeading" />
     </label>
-// highlight-next-line
+// highlight-start
+    <button @onclick="UpdateHeading">
 		Update heading
     </button>
+// highlight-end
 </p>
 
 <p>