docs: fix package names in module registration (#9590)

* docs: fix package names in module registration

* update references

www/apps/resources/app/architectural-modules/notification/sendgrid/page.mdx

@@ -46,12 +46,12 @@ module.exports = defineConfig({
   // ...
   modules: [
     {
-      resolve: "@medusajs/notification",
+      resolve: "@medusajs/medusa/notification",
       options: {
         providers: [
           // ...
           {
-            resolve: "@medusajs/notification-sendgrid",
+            resolve: "@medusajs/medusa/notification-sendgrid",
             id: "sendgrid",
             options: {
               channels: ["email"],