op-build v2.4 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index 52afdb9..bd8f684 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -86,3 +86,4 @@
     :maxdepth: 1
 
     v2.4-rc1
+    v2.4