Added documentation

docs/src/pages/en/guides/markdown-content.md

@@ -33,7 +33,6 @@ In addition to custom components inside the [`<Markdown>` component](/en/guides/
 - [GitHub-flavored Markdown](https://github.com/remarkjs/remark-gfm)
 - [remark-smartypants](https://github.com/silvenon/remark-smartypants)
 - [rehype-slug](https://github.com/rehypejs/rehype-slug)
-- [Prism](https://prismjs.com/)
 
 Also, Astro supports third-party plugins for Markdown. You can provide your plugins in `astro.config.mjs`.
 
@@ -85,6 +84,27 @@ export default {
 };
 ```
 
+### Syntax Highlighting
+
+Astro comes with built-in support for [Prism](https://prismjs.com/) and [Shiki](https://shiki.matsu.io/). By default, Prism is enabled. You can modify this behavior by updating the `@astrojs/markdown-remark` options:
+
+```js
+// astro.config.mjs
+export default {
+  markdownOptions: {
+    render: [
+      '@astrojs/markdown-remark',
+      {
+        // Pick a syntax highlighter. Can be 'prism' (default), 'shiki' or false to disable any highlighting.
+        syntaxHighlight: 'prism',
+        // If you are using shiki, here you can define a global theme.
+        shikiTheme: 'github-dark',
+      },
+    ],
+  },
+};
+```
+
 ## Markdown Pages
 
 Astro treats any `.md` files inside of the `/src/pages` directory as pages. These files can contain frontmatter, but are otherwise processed as plain markdown files and do not support components. If you're looking to embed rich components in your markdown, take a look at the [Markdown Component](#astros-markdown-component) section.