[DOC] - Update calls doc

[briankwest]

status_url and status_events - looks like when the rtc team added it they did not update the docs. But the implementation is here https://github.com/signalwire/cloud-product/issues/8698 and the docs ticket that I found was here.

[briankwest]

This https://developer.signalwire.com/swml/methods/connect#call_state_events
and https://developer.signalwire.com/swml/methods/connect#call_state_url

Need changed Its status_url and status_events