op-build v2.4-rc1 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 1f9feb5..41e43f4 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -77,3 +77,11 @@
    v2.3-rc2
    v2.3
    v2.3.1
+
+v2.4
+----
+
+ .. toctree::
+    :maxdepth: 1
+
+    v2.4-rc1