chore: fix broken links in collections.mdx (#9697)

Fix broken links.

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### What?

Fix broken links to collections and access control overview.

### Why?

### How?

Fixes #

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docs/access-control/collections.mdx

@@ -6,7 +6,7 @@ desc: With Collection-level Access Control you can define which users can create
 keywords: collections, access control, permissions, documentation, Content Management System, cms, headless, javascript, node, react, nextjs
 ---
 
-Collection Access Control is [Access Control](../overview) used to restrict access to Documents within a [Collection](../collections/overview), as well as what they can and cannot see within the [Admin Panel](../admin/overview) as it relates to that Collection.
+Collection Access Control is [Access Control](../access-control/overview) used to restrict access to Documents within a [Collection](../getting-started/concepts#collections), as well as what they can and cannot see within the [Admin Panel](../admin/overview) as it relates to that Collection.
 
 To add Access Control to a Collection, use the `access` property in your [Collection Config](../configuration/collections):