Wrong text for self-managed gateway

In https://<tenant-name>-admin.3scale.net/apiconfig/services/<service-id>
in the `Configuration, Methods and Settings` appears the following text:

On the Integration page, add your API base URL to the Private Base URL field in the staging box and hit Update & Test. Once the staging box is green, proceed to download the NGINX config files for your On-premises NGINX reverse proxy server. Once you've added these config files to your Nginx server you have completed a basic integration.