docs: replace ModuleRegistrationName with Modules (#9142)

www/apps/resources/app/commerce-modules/promotion/examples/page.mdx

@@ -16,14 +16,14 @@ In this document, you’ll find common examples of how you can use the Promotion
   ```ts
   import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
   import { IPromotionModuleService } from "@medusajs/types"
-  import { ModuleRegistrationName } from "@medusajs/utils"
+  import { Modules } from "@medusajs/utils"
 
 export async function POST(
   request: MedusaRequest,
   res: MedusaResponse
 ): Promise<void> {
   const promotionModuleService: IPromotionModuleService = request.scope.resolve(
-    ModuleRegistrationName.PROMOTION
+    Modules.PROMOTION
   )
 
   const promotion = await promotionModuleService.createPromotions({
@@ -81,14 +81,14 @@ export async function POST(request: Request) {
   ```ts
   import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
   import { IPromotionModuleService } from "@medusajs/types"
-  import { ModuleRegistrationName } from "@medusajs/utils"
+  import { Modules } from "@medusajs/utils"
 
 export async function POST(
   request: MedusaRequest,
   res: MedusaResponse
 ): Promise<void> {
   const promotionModuleService: IPromotionModuleService = request.scope.resolve(
-    ModuleRegistrationName.PROMOTION
+    Modules.PROMOTION
   )
 
   const campaign = await promotionModuleService.createCampaigns({
@@ -138,14 +138,14 @@ export async function POST(request: Request) {
   ```ts
   import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
   import { IPromotionModuleService } from "@medusajs/types"
-  import { ModuleRegistrationName } from "@medusajs/utils"
+  import { Modules } from "@medusajs/utils"
 
 export async function POST(
   request: MedusaRequest,
   res: MedusaResponse
 ): Promise<void> {
   const promotionModuleService: IPromotionModuleService = request.scope.resolve(
-    ModuleRegistrationName.PROMOTION
+    Modules.PROMOTION
   )
 
   const promotion = await promotionModuleService.createPromotions({
@@ -216,14 +216,14 @@ export async function POST(request: Request) {
   ```ts
   import { MedusaRequest, MedusaResponse } from "@medusajs/medusa"
   import { IPromotionModuleService } from "@medusajs/types"
-  import { ModuleRegistrationName } from "@medusajs/utils"
+  import { Modules } from "@medusajs/utils"
 
 export async function GET(
   request: MedusaRequest,
   res: MedusaResponse
 ): Promise<void> {
   const promotionModuleService: IPromotionModuleService = request.scope.resolve(
-    ModuleRegistrationName.PROMOTION
+    Modules.PROMOTION
   )
 
   res.json({