Update two links

Please update the following two links, thanks!

https://dlg.usg.edu -> Connect Menu -> Listserv -> https://forms.gle/Lwx2LvLcTonrjL8QA

https://dlg.usg.edu/participate/partner-services -> 'listserv' in first paragraph -> https://forms.gle/Lwx2LvLcTonrjL8QA