fix: update two code snippets in the tutorial (withastro#10727)

* unit 5-3: add missing `any` in Code Check-In
We use `any` before to avoid a Typescript error but it is missing
in the Code Check-In. So if someone decide to replace their code with
the one suggested in Code Check-In they'll get a Typescript error.
* unit 6-2: fix line highlighting

Author: ArmandPhilippot

src/content/docs/en/tutorial/5-astro-api/3.mdx

@@ -210,7 +210,7 @@ Here is what your new page should look like:
 --- 
 import BaseLayout from '../../layouts/BaseLayout.astro';
 const allPosts = Object.values(import.meta.glob('../posts/*.md', { eager: true }));
-const tags = [...new Set(allPosts.map((post) => post.frontmatter.tags).flat())];
+const tags = [...new Set(allPosts.map((post: any) => post.frontmatter.tags).flat())];
 const pageTitle = "Tag Index";
 ---
 <BaseLayout pageTitle={pageTitle}>

src/content/docs/en/tutorial/6-islands/2.mdx

@@ -95,7 +95,7 @@ To add interactivity to an Astro component, you can use a `<script>` tag. This s
 <Steps>
 1. Add the following `<script>` tag in `src/components/ThemeIcon.astro` after your `<style>` tag:
 
-    ```astro title="src/components/ThemeIcon.astro" ins={9-37}
+    ```astro title="src/components/ThemeIcon.astro" ins={9-38}
     <style>
       .sun { fill: black; }
       .moon { fill: transparent; }