docs: clarify unification docs (#3367)

<!-- Describe the problem and your solution --> 

<!-- Issue ticket number and link (if applicable) -->

<!-- Testing instructions (skip if just adding/editing providers) -->

docs-v2/guides/api-unification.mdx

@@ -129,9 +129,9 @@ When dealing with API-specific data or functionality, Nango provides tools to ha
 - **Add API-specific fields:** Include additional fields that are unique to certain APIs when needed. This keeps the unified model clean while supporting specific API capabilities.
 - **Attach the raw external data:** Store raw API responses in a dedicated field to give you maximum flexibility for debugging, advanced use cases, or special handling of certain integrations.
 
-# Contract Nango
+# Hire Nango to build a custom unified API
 
-If you need help building custom unified integrations tailored to your needs, contact Nango. We can provide expertise to accelerate your integration development.
+If you need custom unified integrations tailored to your needs, you can hire Nango to handle the development. Our team also provide expertise to accelerate your integration development. Check out our [services](/guides/services) for details. 
 
 <Tip>
 **Questions, problems, feedback?** Please reach out in the [Slack community](https://nango.dev/slack).