op-build v2.3-rc2 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 c18d369..226a7d4 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -74,3 +74,4 @@
    :maxdepth: 1
 
    v2.3-rc1 
+   v2.3-rc2