op-build v2.2-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 163f3f3..d5daa5c 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -62,3 +62,4 @@
    :maxdepth: 1
 
    v2.2-rc1
+   v2.2-rc2