docs: fix typo in extend core flow (#10709)

* docs: fix typo in extend core flow

* small fixes

www/apps/book/app/learn/customization/extend-features/extend-create-product/page.mdx

@@ -46,7 +46,7 @@ Learn more about the workflow hooks in [this chapter](../../../fundamentals/work
 
 </Note>
 
-The [createProductsWorkflow](!resources!/references/medusa-workflows/createProductsWorkflow) used in the [Create Product API route](!api!/admin#products_postproducts) has a `productsCreated` hook that runs after the product is created. You'll consume this hook to link the created product with the brand specified in the request paramters.
+The [createProductsWorkflow](!resources!/references/medusa-workflows/createProductsWorkflow) used in the [Create Product API route](!api!/admin#products_postproducts) has a `productsCreated` hook that runs after the product is created. You'll consume this hook to link the created product with the brand specified in the request parameters.
 
 To consume the `productsCreated` hook, create the file `src/workflows/hooks/created-product.ts` with the following content:
 
@@ -171,16 +171,19 @@ In the compensation function, if the `links` parameter isn't empty, you resolve
 
 Now that you've consumed the `productCreated` hook, you want to configure the `/admin/products` API route that creates a new product to accept a brand ID in its `additional_data` parameter.
 
-You configure the properties accepted in `additional_data` in the `src/api/middlewares.ts` that exports middleware configurations. So, create `src/api/middlewares.ts` with the following content:
+You configure the properties accepted in `additional_data` in the `src/api/middlewares.ts` that exports middleware configurations. So, create the file (or, if already existing, add to the file) `src/api/middlewares.ts` the following content:
 
 ![Directory structure after adding the middelwares file](https://res.cloudinary.com/dza7lstvk/image/upload/v1733386868/Medusa%20Book/brands-middleware-dir-overview_uczos1.jpg)
 
 ```ts title="src/api/middlewares.ts"
 import { defineMiddlewares } from "@medusajs/framework/http"
 import { z } from "zod"
 
+// ...
+
 export default defineMiddlewares({
   routes: [
+    // ...
     {
       matcher: "/admin/products",
       method: ["POST"],

www/apps/book/generated/edit-dates.mjs

@@ -86,7 +86,7 @@ export const generatedEditDates = {
   "app/learn/customization/custom-features/api-route/page.mdx": "2024-12-09T10:39:30.046Z",
   "app/learn/customization/custom-features/module/page.mdx": "2024-12-09T14:36:02.100Z",
   "app/learn/customization/custom-features/workflow/page.mdx": "2024-12-09T14:36:29.482Z",
-  "app/learn/customization/extend-features/extend-create-product/page.mdx": "2024-12-09T12:59:23.364Z",
+  "app/learn/customization/extend-features/extend-create-product/page.mdx": "2024-12-23T15:42:23.863Z",
   "app/learn/customization/custom-features/page.mdx": "2024-12-09T10:46:28.593Z",
   "app/learn/customization/customize-admin/page.mdx": "2024-12-09T11:02:38.801Z",
   "app/learn/customization/customize-admin/route/page.mdx": "2024-12-09T15:32:46.656Z",