update all the readme's for expressive code (#8691)

Co-authored-by: HiDeoo <HiDeoo@users.noreply.github.com>
Co-authored-by: Genteure <Genteure@users.noreply.github.com>
Co-authored-by: Bryce Russell <brycetrussell@gmail.com>
Co-authored-by: Reuben Tier <TheOtterlord@users.noreply.github.com>
Co-authored-by: Hippo <hippotastic@users.noreply.github.com>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
Co-authored-by: Kevin Zuniga Cuellar <kevinzunigacuellar@users.noreply.github.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/packages/integrations/react/README.md b/packages/integrations/react/README.md
index 00a574c54..d9a3b473c 100644
--- a/packages/integrations/react/README.md
+++ b/packages/integrations/react/README.md
@@ -42,15 +42,16 @@ npm install react react-dom
 
 Now, apply this integration to your `astro.config.*` file using the `integrations` property:
 
-```js ins={3} "react()"
-// astro.config.mjs
-import { defineConfig } from 'astro/config';
-import react from '@astrojs/react';
-
-export default defineConfig({
-  // ...
-  integrations: [react()],
-});
+```diff lang="js" "react()"
+  // astro.config.mjs
+  import { defineConfig } from 'astro/config';
++ import react from '@astrojs/react';
+
+  export default defineConfig({
+    // ...
+    integrations: [react()],
+    //             ^^^^^^^
+  });
 ```
 
 ## Getting started
@@ -72,6 +73,7 @@ Use the `include` (required) and `exclude` (optional) configuration options to s
 We recommend placing common framework components in the same folder (e.g. `/components/react/` and `/components/solid/`) to make specifying your includes easier, but this is not required:
 
 ```js
+// astro.config.mjs
 import { defineConfig } from 'astro/config';
 import preact from '@astrojs/preact';
 import react from '@astrojs/react';