fix(tutorial): update the highlighting color for added code (#11077)

Closes #11039

Co-authored-by: Yan <[email protected]>

Author: ArmandPhilippot

src/content/docs/en/tutorial/5-astro-api/2.mdx

@@ -65,7 +65,7 @@ You can create entire sets of pages dynamically using `.astro` files that export
 
     Be sure to give each route in your array the new props, and then make those props available to your component template outside of your function.
 
-    ```astro title="src/pages/tags/[tag].astro" ins={5,18} "props: {posts: allPosts}" 
+    ```astro title="src/pages/tags/[tag].astro" ins={5,18} ins="props: {posts: allPosts}" 
     ---
     import BaseLayout from '../../layouts/BaseLayout.astro';