Update IRC network to OFTC

Change-Id: I260d9e65782add011f00d9087e0a5ac71e2be324
diff --git a/doc/source/contributor/contributing.rst b/doc/source/contributor/contributing.rst
index 5e0df56..4de238f 100644
--- a/doc/source/contributor/contributing.rst
+++ b/doc/source/contributor/contributing.rst
@@ -13,7 +13,7 @@
 
 Communication
 ~~~~~~~~~~~~~
-* IRC channel ``#openstack-qa`` at FreeNode
+* IRC channel ``#openstack-qa`` at OFTC.
 * Mailing list (prefix subjects with ``[qa][devstack]`` for faster responses)
   http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-discuss