add notes section

keps/sig-apps/4443-configurable-pod-failure-policy-reasons/README.md

@@ -329,12 +329,9 @@ spec:
 
 ### Notes/Constraints/Caveats (Optional)
 
-<!--
-What are the caveats to the proposal?
-What are some important details that didn't come across above?
-Go in to as much detail as necessary here.
-This might be a good place to talk about core concepts and how they relate.
--->
+It should be noted that upon pod failure, the Job's pod failure policy rules
+are evaluated in order, and only the first matching rule is executed, even
+if multiple rules match a pod failure.
 
 ### Risks and Mitigations