add a Chinese description in virt.md

content/zh/maillist/virt.md

 +++
 listname = "Virt"
 emailaddress = "virt@openeuler.org"
-description = ""
+description = "用于讨论虚拟化的开发"
 websitelink = "https://mailweb.openeuler.org/postorius/lists/virt.openeuler.org/"
 archivelink = "https://mailweb.openeuler.org/hyperkitty/list/virt@openeuler.org"
 weight =  15