data/xbps.conf: remove old mirrors

Author: classabbyamp

data/xbps.conf

@@ -48,15 +48,7 @@
 
 ## REPOSITORY MIRRORS
 #
-# - https://beta.de.repo.voidlinux.org/current
-# - https://beta.de.repo.voidlinux.org/current/nonfree
-# - https://beta.de.repo.voidlinux.org/current/multilib
-# - https://beta.de.repo.voidlinux.org/current/multilib/nonfree
-#
-# - http://alpha.us.repo.voidlinux.org/current
-# - http://alpha.us.repo.voidlinux.org/current/nonfree
-# - http://alpha.us.repo.voidlinux.org/current/multilib
-# - http://alpha.us.repo.voidlinux.org/current/multilib/nonfree
+# For a complete list, see https://docs.voidlinux.org/xbps/repositories/mirrors/
 
 ## PRESERVING FILES
 #