docs: document composite indices + primary key changes (#7902)

www/apps/resources/app/commerce-modules/auth/create-actor-type/page.mdx

@@ -16,7 +16,7 @@ The rest of this guide uses this `Manager` data model as an example:
 import { model } from "@medusajs/utils"
 
 const Manager = model.define("manager", {
-  id: model.id(),
+  id: model.id().primaryKey(),
   firstName: model.text(),
   lastName: model.text(),
   email: model.text(),

www/apps/resources/app/recipes/b2b/page.mdx

@@ -229,7 +229,7 @@ Module Relationships is coming soon.
   import { model } from "@medusajs/utils"
 
   const Company = model.define("company", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     name: model.text(),
     city: model.text(),
     country_code: model.text(),

www/apps/resources/app/recipes/commerce-automation/page.mdx

@@ -94,7 +94,7 @@ export const restockModelHighlights = [
   import { model } from "@medusajs/utils"
 
   const RestockNotification = model.define("restock_notification", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     email: model.text(),
     variant_id: model.text(),
     sales_channel_id: model.text(),

www/apps/resources/app/recipes/digital-products/page.mdx

@@ -182,7 +182,7 @@ Module Relationships is coming soon.
   import { MediaType } from "../../../types/digital-product/product-media"
 
   const ProductMedia = model.define("product_media", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     name: model.text(),
     type: model.enum(Object.values(MediaType)),
     fileKey: model.text(),

www/apps/resources/app/recipes/marketplace/page.mdx

@@ -69,7 +69,7 @@ Module Relationships is coming soon.
   import { model } from "@medusajs/utils"
 
   const StoreUser = model.define("store_user", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     store_id: model.text(),
     user_id: model.text(),
   })
@@ -87,7 +87,7 @@ Module Relationships is coming soon.
   import { model } from "@medusajs/utils"
 
   const StoreProduct = model.define("store_user", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     store_id: model.text(),
     product_id: model.text(),
   })
@@ -105,7 +105,7 @@ Module Relationships is coming soon.
   import { model } from "@medusajs/utils"
 
   const StoreOrder = model.define("store_user", {
-    id: model.id(),
+    id: model.id().primaryKey(),
     store_id: model.text(),
     order_id: model.text(),
     parent_order_id: model.text(),