docs: Update ai-api.mdx (#9265)

Remove verbiage that says Cube team needs to enable AI API

Co-authored-by: Igor Lukanin <[email protected]>

Author: morgan-at-cube

docs/pages/product/apis-integrations/ai-api.mdx

@@ -7,8 +7,7 @@ Specifically, you can send the AI API a message (or conversation of messages) an
 <WarningBox>
   The AI API is available on [Cube
   Cloud](/getting-started#getting-started-with-cube-cloud) only. It is currently
-  in preview and should not be used for production workloads. Please contact
-  your Cube representative to have it enabled for your account.
+  in preview and should not be used for production workloads.
 </WarningBox>
 
 See [AI API reference][ref-ref-ai-api] for the list of supported API endpoints.