Update SMS section with correct hostnames
The hostnames on https://guidebook.devops.uis.cam.ac.uk/en/latest/services/streaming-media/ are incorrect and shoulnd't contain the .csx. subdomain
Edited by Dr Abraham Martin
The hostnames on https://guidebook.devops.uis.cam.ac.uk/en/latest/services/streaming-media/ are incorrect and shoulnd't contain the .csx. subdomain