docs: general improvements and additions (#12296)

www/apps/book/app/learn/fundamentals/api-routes/retrieve-custom-links/page.mdx

@@ -60,7 +60,7 @@ export const highlights = [
 ]
 
 ```ts title="src/api/middlewares.ts" highlights={highlights}
-import { defineMiddlewares } from "@medusajs/medusa";
+import { defineMiddlewares } from "@medusajs/medusa"
 
 export default defineMiddlewares({
   routes: [
@@ -69,13 +69,13 @@ export default defineMiddlewares({
       method: "GET",
       middlewares: [
         (req, res, next) => {
-          req.allowed?.push("b2b_company");
-          next();
+          req.allowed?.push("b2b_company")
+          next()
         },
       ],
     },
   ],
-});
+})
 ```
 
 In this example, you apply a middleware to the [Get Customer Admin API Route](!api!/admin#customers_getcustomersid).