Update a reference to the former #cpp channel

Author: claremacrae

discord/index.md

@@ -74,7 +74,7 @@ We also have channels for many C++ conferences. See [\#conferences](https://disc
 
 ## Direct Messages
 
-Discord provides a capability for sending private (direct) messages (DMs) to a single user. In most cases, requests for help or for more information belong in a channel, such as #cpp for C++ questions. Reserve DMs for conversations that can only be one on one, and understand that some users may prefer not to have such conversations. Remember also that some may be in a very different time zone from you.
+Discord provides a capability for sending private (direct) messages (DMs) to a single user. In most cases, requests for help or for more information belong in a channel, such as #cpp-beginners and #cpp-general for C++ questions. Reserve DMs for conversations that can only be one on one, and understand that some users may prefer not to have such conversations. Remember also that some may be in a very different time zone from you.
 
 To send DMs, you either need to have a Discord server (such as `#include <C++>`) in common, or be Friends.