small formatting update

Author: devalog

fern/products/sdks/overview/typescript/custom-code.mdx

@@ -23,27 +23,23 @@ To get started adding custom code:
 
     ### Create a new file and add your custom logic
 
-    <CodeBlock title="src/helper.ts">
-    ```typescript 
+    ```typescript title="src/helper.ts"
     export function myHelper(): void {
     return console.log("Hello world!");
     }
     ```
-    </CodeBlock>
 
     ### Add your file to `.fernignore`
 
     <Tip>A `.fernignore` file is automatically created in your SDK repository when you use GitHub publishing.</Tip>
 
-    <CodeBlock title=".fernignore">
-    ```yaml {3}
+
+    ```yaml {3} title=".fernignore"
     # Specify files that shouldn't be modified by Fern
 
     src/helper.ts
     ```
 
-    </CodeBlock>
-
     ### Consume the helper
 
     Now your users can consume the helper function by importing it from the SDK: