Update netx-locations-and-endpoints.md
Update netx-locations-and-endpoints.md

Added a hyperlink to the Network Exchange product page (https://www.ctl.io/network-exchange/)
jtowns3/PublicKB,robcaldwell/PublicKB,anthonyvetter/PublicKB,mfar78/PublicKB,robertlesieur/PublicKB,ack/PublicKB,daveshac/PublicKB,StephanieWong/PublicKB,jwebs1/PublicKB,jwcolbert/PublicKB,DLM1/PublicKB