Fix #6442

Removed IRC reference

documentation/jetty-documentation/src/main/asciidoc/old_docs/contributing/community.adoc

@@ -36,12 +36,3 @@ We have a number of options for people that wish to subscribe to our mailing lis
 ** Join - https://dev.eclipse.org/mailman/listinfo/jetty-commit
 ** Archives - https://dev.eclipse.org/mhonarc/lists/jetty-commit/
 
-[[community-irc]]
-==== Internet Relay Chat - IRC
-
-Much of our conversations about Jetty occur on IRC in one location or another.
-Users are always welcome to come join our IRC channels and talk with us, other users, or just lurk.
-
-irc.freenode.org - #jetty::
-Our primary location, we recommend that if your looking to find folks on IRC you try here.
-We also have commit notifications coming to this channel on the bottom and top of the hour.