docs: edits and fixes to commerce module docs (#7468)

Apply edits and fixes to the commerce modules docs

www/apps/resources/app/commerce-modules/customer/customer-accounts/page.mdx

@@ -8,7 +8,7 @@ In this document, you’ll learn how registered and unregistered accounts are di
 
 ## `has_account` field
 
-The `Customer` data model has a `has_account` field, which is a boolean that indicates whether a customer is registerd.
+The [Customer data model](/references/customer/models/Customer) has a `has_account` field, which is a boolean that indicates whether a customer is registerd.
 
 When a guest customer places an order, a new `Customer` record is created with `has_account` set to `false`.
 
@@ -20,4 +20,4 @@ When this or another guest customer registers an account with the same email, a
 
 The above behavior means that two `Customer` records may exist of the same email. However, the main difference is the `has_account` field’s value.
 
-So, there can only be one guest customer (having `has_account=false`) and one registered customer (having `has_account=true`) with the same email. If another customer tries to create an account with the same email, they’ll get an error that an account with this email already exists.
+So, there can only be one guest customer (having `has_account=false`) and one registered customer (having `has_account=true`) with the same email.

www/apps/resources/app/commerce-modules/customer/events/page.mdx

@@ -8,4 +8,10 @@ export const metadata = {
 
 Find in this reference the list of events emitted by the Customer Module.
 
+<Note type="soon">
+
+Events are still in development, so this reference will change in the future.
+
+</Note>
+
 <EventsTable />

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

@@ -233,4 +233,4 @@ In this guide, you’ll find common examples of how you can use the Customer Mod
 
 ## More Examples
 
-The [module interface reference](/references/customer) provides a reference to all the methods available for use with examples for each.
+The [Customer Module's main service reference](/references/customer) provides a reference to all the methods available for use with examples for each.

www/apps/resources/app/commerce-modules/customer/page.mdx

@@ -42,14 +42,16 @@ await customerModuleService.addCustomerToGroup({
 
 ## Configure Customer Module
 
-After installing the `@medusajs/customer` package in your Medusa application, add it to the `modules` object in `medusa-config.js`:
+To use the Customer Module, enable it in the `modules` object in `medusa-config.js`:
 
 ```js title="medusa-config.js"
+const { Modules } = require("@medusajs/modules-sdk")
+
+// ...
+
 const modules = {
   // ...
-  customer: {
-    resolve: "@medusajs/customer",
-  },
+  [Modules.CUSTOMER]: true,
 }
 ```
 
@@ -108,9 +110,11 @@ For example:
   import { ICustomerModuleService } from "@medusajs/types"
   import { ModuleRegistrationName } from "@medusajs/modules-sdk"
 
-  const step1 = createStep("step-1", async (_, context) => {
+  const step1 = createStep(
+    "step-1", 
+    async (_, { container }) => {
     const customerModuleService: ICustomerModuleService =
-      context.container.resolve(ModuleRegistrationName.PRODUCT)
+      container.resolve(ModuleRegistrationName.CUSTOMER)
 
     const customers = await customerModuleService.list()
   })

www/apps/resources/app/commerce-modules/customer/relations-to-other-modules/page.mdx

@@ -4,13 +4,19 @@ export const metadata = {
 
 # {metadata.title}
 
-When Commerce Modules are used together in a Medusa application, the Medusa application handles building the relations between these modules.
-
-This document showcases the relation between the Customer Module and other Commerce Modules.
+This document showcases the link modules defined between the Customer Module and other commerce modules.
 
 ## Cart Module
 
-A customer has a cart to purchase items from the store. The Medusa application forms a relation between the `Customer` and the `Cart` data models.
+A customer has a cart to purchase items from the store. Medusa defines a link module that builds a relationship between the `Customer` and the `Cart` data models.
 
-![A diagram showcasing an example of how resources from the Customer and Cart modules are linked](https://res.cloudinary.com/dza7lstvk/image/upload/v1709915775/Medusa%20Resources/customer-cart_by5e7s.jpg)
+![A diagram showcasing an example of how data models from the Customer and Cart modules are linked](https://res.cloudinary.com/dza7lstvk/image/upload/v1711537276/Medusa%20Resources/cart-customer_pnjvuw.jpg)
+
+---
+
+## Order Module
+
+A customer is associated with the orders they place. Medusa defines a link module that builds a relationship between the `Customer` and the `Order` data models.
+
+![A diagram showcasing an example of how data models from the Customer and Order modules are linked](https://res.cloudinary.com/dza7lstvk/image/upload/v1716545470/Medusa%20Resources/customer-order_pkla6f.jpg)