docs: document variant inventory conceptual guide (#11280)

* docs: document variant inventory conceptual guide

* add notes

* fix vale error

* fix vale error

www/apps/resources/app/commerce-modules/inventory/links-to-other-modules/page.mdx

@@ -31,6 +31,12 @@ Each product variant has different inventory details. Medusa defines a link betw
 
 A product variant whose `manage_inventory` property is enabled has an associated inventory item. Through that inventory's items relations in the Inventory Module, you can manage and check the variant's inventory quantity.
 
+<Note title="Tip">
+
+Learn more about product variant's inventory management in [this guide](../../product/variant-inventory/page.mdx).
+
+</Note>
+
 ### Retrieve with Query
 
 To retrieve the product variants of an inventory item with [Query](!docs!/learn/fundamentals/module-links/query), pass `variants.*` in `fields`: