[doc] added links to discord and discourse

Some folks are not aware that we have a Discourse server in addition to the mailing lists and a Discord server in addition to IRC. So I think we should add that.
These were announced on the mailing list a while ago: https://lists.llvm.org/pipermail/llvm-dev/2019-November/136880.html

Differential Revision: https://reviews.llvm.org/D100943

diff --git a/llvm/docs/GettingInvolved.rst b/llvm/docs/GettingInvolved.rst
index 28b5e26..e051ce1 100644 (file)
--- a/llvm/docs/GettingInvolved.rst
+++ b/llvm/docs/GettingInvolved.rst
@@ -98,7 +98,8 @@ Mailing Lists
 -------------\r
 \r
 If you can't find what you need in these docs, try consulting the mailing\r
-lists.\r
+lists. In addition to the traditional mailing lists there is also a \r
+`Discourse server <https://llvm.discourse.group>`_ available. \r
 \r
 `Developer's List (llvm-dev)`__\r
   This list is for people who want to be included in technical discussions of\r
@@ -228,6 +229,12 @@ This channel has several bots.
 * clang-bot - A `geordi <http://www.eelis.net/geordi/>`_ instance running\r
   near-trunk clang instead of gcc.\r
 \r
+In addition to the traditional IRC there is a \r
+`Discord <https://discord.com/channels/636084430946959380/636725486533345280>`_ \r
+chat server available. To sign up, please use this \r
+`invitation link <https://discord.com/invite/xS7Z362>`_.\r
+  \r
+\r
 .. _meetups-social-events:\r
 \r
 Meetups and social events\r