Remove reference to outdated IRC channel

Closes #4109

Author: coke

doc/Language/modules.pod6

@@ -1128,9 +1128,7 @@ To discuss module development in general, or if your module would
 fill a need in the ecosystem, naming, etc., you can use the
 L<#raku on irc.libera.chat|irc://irc.libera.chat/#raku> IRC channel.
 
-To discuss toolchain specific questions, you can use the
-L<#raku-toolchain on irc.libera.chat|irc://irc.libera.chat/#raku-toolchain>
-IRC channel. A repository to discuss tooling issues is also available at
+A repository to discuss tooling issues is available at
 L<https://github.com/Raku/toolchain-bikeshed>.
 
 =end pod