docs: typo fixes in execute workflow section (#10911)

Author: shahednasser

www/apps/book/app/learn/fundamentals/workflows/page.mdx

@@ -154,14 +154,14 @@ To execute the workflow, invoke it passing the [Medusa container](../medusa-cont
   </CodeTab>
   <CodeTab label="Subscriber" value="subscriber">
 
-    ```ts title="src/subscribers/customer-created.ts" highlights={[["11"], ["12"], ["13"], ["14"], ["15"], ["16"]]} collapsibleLines="1-6" expandButtonLabel="Show Imports"
+    ```ts title="src/subscribers/order-placed.ts" highlights={[["11"], ["12"], ["13"], ["14"], ["15"], ["16"]]} collapsibleLines="1-6" expandButtonLabel="Show Imports"
     import {
       type SubscriberConfig,
       type SubscriberArgs,
     } from "@medusajs/framework"
     import myWorkflow from "../workflows/hello-world"
 
-    export default async function handleCustomerCreate({
+    export default async function handleOrderPlaced({
       event: { data },
       container,
     }: SubscriberArgs<{ id: string }>) {
@@ -290,4 +290,4 @@ You can now execute this workflow in a custom API route, scheduled job, or subsc
 
 Find a full list of the registered resources in the Medusa container and their registration key in [this reference](!resources!/medusa-container-resources). You can use these resources in your custom workflows.
 
-</Note>
+</Note>