docs: added manage returns documentation (#3943)

docs/content/modules/orders/admin/manage-swaps.mdx

@@ -23,6 +23,12 @@ You want to add or use the following admin functionalities:
 - Manage a swap’s fulfillment. This includes creating a fulfillment, creating a shipment, and canceling a fulfillment.
 - Cancel a swap.
 
+:::note
+
+You can learn about managing returns in the [Manage Returns documentation](./manage-returns.mdx).
+
+:::
+
 ---
 
 ## Prerequisites
@@ -534,3 +540,4 @@ The request returns the updated order as an object. You can access the swaps usi
 ## See Also
 
 - [How to manage orders using admin APIs](./manage-orders.mdx)
+- [How to manage returns using admin APIs](./manage-returns.mdx)