docs: added settings user guides (#2586)

docs/content/user-guide/orders/exchange.mdx

@@ -31,7 +31,7 @@ To create an order exchange:
 4. In the new window that opens:
     1. Choose the items you want the customer to return. For each item you select:
         1. Click on the Select Reason button.
-        2. Choose a reason from available Reasons. If you can’t find any Reasons, make sure to add Return Reasons in Settings first.
+        2. Choose a reason from available Reasons. If you can’t find any Reasons, make sure to add [Return Reasons in Settings](../settings/return-reasons.mdx#add-return-reason) first.
         3. You can optionally add a Note.
         4. Once you’re done, click on the Add button.
     2. Choose a Shipping Method to return the customer’s items.

docs/content/user-guide/orders/returns.mdx

@@ -41,7 +41,7 @@ To request a return for an order:
 4. In the new window that opens:
     - Choose the items in the order that you want to request the return.
     - For each item that you choose, click on the Select Reason below that item.
-        - Choose a Return Reason, optionally enter a Note, then click the Add button.
+        - Choose a [Return Reason](../settings/return-reasons.mdx#add-return-reason), optionally enter a Note, then click the Add button.
     - Select a shipping method you want to use for this return.
         - If you want to change the default price of the shipping method, click on the “Add custom price” button and enter the price you want to use.
         - If you want to remove the custom price, you can click on the <UiIcon lightIcon="https://res.cloudinary.com/dza7lstvk/image/upload/v1667999273/Medusa%20Docs/UI%20Icons/7hztVhj_mj6mxu.png" darkIcon="https://res.cloudinary.com/dza7lstvk/image/upload/v1667999290/Medusa%20Docs/UI%20Icons/1yp4PNt_vzwnhf.png" alt="trash" /> icon.