Switch the headings to match the content (#9619)

HEading and content was switched for payment and file modules

www/apps/resources/app/integrations/page.mdx

@@ -8,9 +8,9 @@ export const metadata = {
 
 Find in this document Medusa's modules that integrate third-party services and systems.
 
-## Payment
+## File
 
-Learn how to create a payment provider in [this guide](/references/payment/provider).
+Learn how to create a file provider in [this guide](/references/file-provider-module).
 
 <CardList
   items={[
@@ -38,9 +38,9 @@ Learn how to create a notification provider in [this guide](/references/notifica
 
 ---
 
-## File
+## Payment
 
-Learn how to create a file provider in [this guide](/references/file-provider-module).
+Learn how to create a payment provider in [this guide](/references/payment/provider).
 
 <CardList
   items={[