Merge pull request #25764 from pacoxu/patch-2

add notes for that strategic merge patch is unsupported for CR

Author: k8s-ci-robot

content/en/docs/tasks/manage-kubernetes-objects/update-api-object-kubectl-patch.md

@@ -445,6 +445,9 @@ and
 [kubectl apply](/docs/reference/generated/kubectl/kubectl-commands/#apply).
 
 
+{{< note >}}
+Strategic merge patch is not supported for custom resources.
+{{< /note >}}
 
 
 ## {{% heading "whatsnext" %}}