docs: rename Architectural Modules to Infrastructure Modules (#12212)

* docs: rename Architectural Modules to Infrastructure Modules

* generate again

www/apps/book/app/learn/fundamentals/modules/infrastructure-modules/page.mdx

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+export const metadata = {
+  title: `${pageNumber} Infrastructure Modules`,
+}
+
+# {metadata.title}
+
+In this chapter, you’ll learn about Infrastructure Modules.
+
+## What is an Infrastructure Module?
+
+An Infrastructure Module implements features and mechanisms related to the Medusa application’s architecture and infrastructure.
+
+Since modules are interchangeable, you have more control over Medusa’s architecture. For example, you can choose to use Memcached for event handling instead of Redis.
+
+---
+
+## Infrastructure Module Types
+
+There are different Infrastructure Module types including:
+
+![Diagram illustrating how the modules connect to third-party services](https://res.cloudinary.com/dza7lstvk/image/upload/v1727095814/Medusa%20Book/infrastructure-modules_bj9bb9.jpg)
+
+- Cache Module: Defines the caching mechanism or logic to cache computational results.
+- Event Module: Integrates a pub/sub service to handle subscribing to and emitting events.
+- Workflow Engine Module: Integrates a service to store and track workflow executions and steps.
+- File Module: Integrates a storage service to handle uploading and managing files.
+- Notification Module: Integrates a third-party service or defines custom logic to send notifications to users and customers.
+- Locking Module: Integrates a service that manages access to shared resources by multiple processes or threads.
+
+---
+
+## Infrastructure Modules List
+
+Refer to the [Infrastructure Modules reference](!resources!/infrastructure-modules) for a list of Medusa’s Infrastructure Modules, available modules to install, and how to create an Infrastructure Module.