docs: replace ModuleRegistrationName with Modules (#9142)

www/apps/book/app/basics/workflows/page.mdx

@@ -127,7 +127,7 @@ To execute the workflow, invoke it passing the Medusa container as a parameter.
       type SubscriberArgs,
     } from "@medusajs/medusa"
     import myWorkflow from "../workflows/hello-world"
-    import { ModuleRegistrationName } from "@medusajs/utils"
+    import { Modules } from "@medusajs/utils"
     import { IUserModuleService } from "@medusajs/types"
 
     export default async function handleCustomerCreate({
@@ -136,7 +136,7 @@ To execute the workflow, invoke it passing the Medusa container as a parameter.
     }: SubscriberArgs<{ id: string }>) {
       const userId = data.id
       const userModuleService: IUserModuleService = container.resolve(
-        ModuleRegistrationName.USER
+        Modules.USER
       )
 
       const user = await userModuleService.retrieveUser(userId)
@@ -231,7 +231,7 @@ export const highlights = [
   ["12", "resolve", "Resolve the Product Module's main service."],
   [
     "12",
-    "ModuleRegistrationName.PRODUCT",
+    "Modules.PRODUCT",
     "The resource registration name imported from `@medusajs/utils`.",
   ],
 ]
@@ -244,11 +244,11 @@ import {
   WorkflowResponse,
 } from "@medusajs/workflows-sdk"
 import { IProductModuleService } from "@medusajs/types"
-import { ModuleRegistrationName } from "@medusajs/utils"
+import { Modules } from "@medusajs/utils"
 
 const step1 = createStep("step-1", async (_, context) => {
   const productModuleService: IProductModuleService =
-    context.container.resolve(ModuleRegistrationName.PRODUCT)
+    context.container.resolve(Modules.PRODUCT)
 
   const [, count] = await productModuleService.listAndCountProducts()