add release note

g0rgamesh · g0rgamesh · commit 00f2518256d0 · 2023-09-28T10:56:06.000+02:00
diff --git a/releasenotes/notes/enable_ovn-b84974f398242dcb.yaml b/releasenotes/notes/enable_ovn-b84974f398242dcb.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Enabled ML2/OVN by default as checks preventing accidental migration
+    from ML2/OVS were added in kolla-ansible.
