Change domain from opencord.org to lfbroadband.org

We have moved all sites from the opencord.org domain to
lfbroadband.org (except wiki/Jira, which are now hosted on Atlassian
Cloud).

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I9624ae92e9c193fa2d2fac9ab30ad108a812306e
diff --git a/howto/release/preparation.rst b/howto/release/preparation.rst
index 7ce4faa..2d78de2 100644
--- a/howto/release/preparation.rst
+++ b/howto/release/preparation.rst
@@ -31,7 +31,7 @@
 
 Confluence
 ----------
-Create a `release tracking page <https://wiki.opencord.org>`_ in confluence, there are a lot of details
+Create a `release tracking page <https://lf-broadband.atlassian.net/wiki>`_ in confluence, there are a lot of details
 
 - Jira tickets related to release and VOLTHA builds.
 - Jenkins jobs: state, failures and tickets.