update title and code highlighting

Author: devalog

fern/products/docs/pages/component-library/custom-components/reusable-markdown.mdx

@@ -1,17 +1,17 @@
 ---
-title: Reusable Markdown
-description: Reusable, custom markdown to keep content in sync. Edit once, update everywhere.
+title: Reusable snippets
+description: Reusable, custom markdown snippets to keep content in sync. Edit once, update everywhere.
 ---
 
-Keep your documentation DRY (Don't Repeat Yourself) by defining a reusable snippet once, and then referencing it in multiple places. This way, you only need to update the snippet in one place to keep all references in sync.
+Keep your documentation DRY (Don't Repeat Yourself) by defining a reusable Markdown snippet once, and then referencing it in multiple places. This way, you only need to update the snippet in one place to keep all references in sync.
 
 ## Create a reusable snippet
 
-To use reusable snippets, start by creating a new folder in your `fern` project called `snippets`. Inside the `snippets` folder, create a new file for each snippet you want to define.
+To use reusable snippets, start by creating a new folder in your `fern` project called `snippets`. Inside the `snippets` folder, create a new Markdown file for each snippet you want to define.
 
 For example: 
 
-```bash
+```bash {3, 6-8}
 fern
 └─ pages
     └─ my-tutorial.mdx