Update Swagger documentation to include service_provider_sid in VoIP Carrier creation

[andrewcallsandy]

Hi,

I encountered an issue on jambonz.cloud when I was creating a carrier. Initially, the carrier was not displaying correctly in the web interface. After some troubleshooting, I found that including the service_provider_sid in the POST request resolved the issue, and the carrier then displayed correctly.

However, the current Swagger documentation for creating a VoIP carrier does not show service_provider_sid as a required field. This can lead to confusion and issues for other users as well.

Could you please update the Swagger documentation to include service_provider_sid in the POST request for creating a VoIP carrier?

Thanks!