Bulk wiki url fix for 'make linkcheck'

howto/code/linting.rst
howto/elections/urls
howto/release/components/onos_components.rst
howto/release/preparation.rst
howto/release/voltha-docs/release_notes.rst
index.rst
overview/contributing.rst
overview/contributing/copyright.rst
release_notes/template.rst
release_notes/voltha_2.12.rst
---------------------------------------------
  o Wiki server attack rendered several doc links unusable.
  o Overhead for make linkcheck target is painful, 1-3 min timeout per URL.
  o Redirect broken URLs to wiki.opencord.org to avoid overhead.

Change-Id: I1a0045c4b71a936a55ff003b810cb7a1611a28a2
diff --git a/howto/release/preparation.rst b/howto/release/preparation.rst
index fe41e28..c922106 100644
--- a/howto/release/preparation.rst
+++ b/howto/release/preparation.rst
@@ -18,7 +18,7 @@
 
 Confluence
 ----------
-Create a `release tracking page <https://wiki.opennetworking.org/display/VOLTHA/v2.12>`_ in confluence, there are a lot of details
+Create a `release tracking page <https://wiki.opencord.org>`_ in confluence, there are a lot of details
 
 - Jira tickets related to release and VOLTHA builds.
 - Jenkins jobs: state, failures and tickets.