docs: revise last chapters of customizations (#10480)

www/apps/book/app/learn/customization/custom-features/workflow/page.mdx

@@ -124,7 +124,7 @@ You can now create the workflow that runs the `createBrandStep`. A workflow is c
 
 Add the following content in the same `src/workflows/create-brand.ts` file:
 
-```ts
+```ts title="src/workflows/create-brand.ts"
 // other imports...
 import {
   // ...