docs: fixes to type errors in guides (#13797)

www/apps/resources/app/nextjs-starter/guides/storefront-returns/page.mdx

@@ -215,7 +215,7 @@ export const createReturnRequest = async (
         return_shipping: {
           option_id: returnShippingOptionId,
         },
-        location_id: locationId
+        location_id: locationId,
       },
       headers,
     })
@@ -671,7 +671,7 @@ export const returnShippingSelectorHighlights = [
 
 import React, { 
   useEffect, 
-  useState
+  useState,
 } from "react"
 import { RadioGroup } from "@headlessui/react"
 import { HttpTypes } from "@medusajs/types"
@@ -911,7 +911,7 @@ const ReturnRequestTemplate: React.FC<ReturnRequestTemplateProps> = ({
     formData.append("items", JSON.stringify(selectedItems))
     formData.append("return_shipping_option_id", selectedShippingOption)
     // @ts-expect-error issue in HTTP types
-    const locationId = shippingOptions.find(opt => opt.id === selectedShippingOption)?.service_zone.fulfillment_set.location.id
+    const locationId = shippingOptions.find((opt) => opt.id === selectedShippingOption)?.service_zone.fulfillment_set.location.id
     formData.append("location_id", locationId)
     formAction(formData)
   }