[VOL-2903] Release notes for 2.3 and relocation of kind-voltha

Change-Id: Iedc86d15b8e12933d1a8f8823e86a9bfb7ce4cbb
diff --git a/index.rst b/index.rst
index b1039c2..0483c9c 100644
--- a/index.rst
+++ b/index.rst
@@ -77,4 +77,4 @@
    :caption: Releases
    :glob:
 
-   release-notes/*
+   release_notes/*