fix: heading order (#7803)

Author: hbuchel

src/pages/[platform]/build-a-backend/auth/grant-access-to-auth-resources/index.mdx

@@ -54,7 +54,7 @@ When you grant a function access to another resource in your Amplify backend it
 
 </Callout>
 
-### List of actions
+## List of actions
 
 |Action Name|Description|Cognito IAM Actions|
 |-|-|-|