fix broken links

Author: josefaidt

src/pages/[platform]/build-a-backend/auth/concepts/user-attributes/index.mdx

@@ -102,7 +102,7 @@ export const auth = defineAuth({
 })
 ```
 
-Unlike standard attributes, custom attributes cannot natively be required for sign-up, however can be codified to require some value by [validating user attributes upon sign-up with a pre sign-up trigger](/[platform]/build-a-backend/functions/user-attribute-validation/).
+Unlike standard attributes, custom attributes cannot natively be required for sign-up, however can be codified to require some value by [validating user attributes upon sign-up with a pre sign-up trigger](/[platform]/build-a-backend/functions/examples/user-attribute-validation/).
 
 Custom attributes can also be configured with specific data types. The following data types are supported:
 

src/pages/[platform]/build-a-backend/auth/connect-your-frontend/manage-user-attributes/index.mdx

@@ -905,4 +905,4 @@ async function handleDeleteUserAttributes(
 ## Next Steps 
 
 - [Learn how to set up password change and recovery](/[platform]/build-a-backend/auth/manage-users/manage-passwords/)
-- [Learn how to set up custom attributes](/[platform]/build-a-backend/auth/concepts/user-attributes/#custom-attributes)
+- [Learn how to set up custom attributes](/[platform]/build-a-backend/auth/concepts/user-attributes#custom-attributes)