WSUG: Update Telephony in WSUG content from wiki
Summary
9.1 Telephony -> Introduction references the statistics page: https://gitlab.com/wireshark/wireshark/wikis/Statistics
Most of the links are right back to the WSUG Some exceptions worth migrating: https://gitlab.com/wireshark/wireshark/-/wikis/VoIP_calls
https://gitlab.com/wireshark/wireshark/-/wikis/Multicast_streams
Recommendation: Migrate and then delete most of the content on those wiki pages