Add manual intervention annotation.

Signed-off-by: Cem Mergenci <[email protected]>

examples/mq/v1alpha1/user.yaml

@@ -7,6 +7,7 @@ kind: User
 metadata:
   annotations:
     meta.upbound.io/example-id: mq/v1alpha1/user
+    upjet.upbound.io/manual-intervention: "Note that there is a race between Broker and User controllers."
   labels:
     testing.upbound.io/example-name: example
   name: example