[VOL-5009] - Create release notes for the v2.12 page.

Change-Id: Iafbc6b683cae034f7cbaf6b0a90c90120bc89506
diff --git a/conf.py b/conf.py
index 654136c..cfd7dd4 100644
--- a/conf.py
+++ b/conf.py
@@ -325,6 +325,7 @@
         r'../release_notes/voltha_2.9.html',
         r'../release_notes/voltha_2.10.html',
         r'../release_notes/voltha_2.11.html',
+        r'../release_notes/voltha_2.12.html',
         #
         r'../voltha-helm-charts/README.html',
     ]