docs: fixes to content and UI (#12101)

www/apps/book/app/learn/resources/contribution-guidelines/docs/page.mdx

@@ -12,6 +12,17 @@ This guide is specific to contributing to the documentation. If you’re interes
 
 </Note>
 
+## What Can You Contribute?
+
+You can contribute to the Medusa documentation in the following ways:
+
+- Fixes to existing content. This includes small fixes like typos, or adding missing information.
+- Additions to the documentation. If you think a documentation page can be useful to other developers, you can contribute by adding it.
+    - Make sure to open an issue first in the [medusa repository](https://github.com/medusajs/medusa) to confirm that you can add that documentation page.
+- Fixes to UI components and tooling. If you find a bug while browsing the documentation, you can contribute by fixing it.
+
+---
+
 ## Documentation Workspace
 
 Medusa's documentation projects are all part of the documentation yarn workspace, which you can find in the [medusa repository](https://github.com/medusajs/medusa) under the `www` directory.

www/apps/resources/app/architectural-modules/locking/page.mdx

@@ -140,7 +140,7 @@ When you register other providers in `medusa-config.ts`, Medusa will set the def
 
 ## List of Locking Module Providers
 
-Medusa provides the following Locking Module Providers. You can use one of them, or [Create a Locking Module Provider](./references/locking-module-provider).
+Medusa provides the following Locking Module Providers. You can use one of them, or [Create a Locking Module Provider](/references/locking-module-provider).
 
 <CardList
   items={[

www/apps/ui/src/config/sidebar.tsx

@@ -53,12 +53,20 @@ export const sidebars: Sidebar.Sidebar[] = [
         ],
       },
       {
-        type: "link",
+        type: "category",
         title: "Icons",
+        loaded: true,
+        initialOpen: true,
+        children: [
+          {
+            type: "link",
+            title: "Overview",
             path: "/icons/overview",
             isPathHref: true,
             loaded: true,
           },
+        ],
+      },
       {
         type: "separator",
       },