Update content/en/docs/concepts/content-placement/placement.md

Co-authored-by: Mike Ng <[email protected]>

Author: haoqing0110

content/en/docs/concepts/content-placement/placement.md

@@ -97,7 +97,7 @@ Note that the distinction between label-selecting and claim-selecting is
 elaborated in [this page]({{< ref "docs/scenarios/extending-managed-clusters" >}})
 about how to extend attributes for the managed clusters.
 
-2. Using CEL expressions:
+#### CEL Expression Selection
 
 ```yaml
 apiVersion: cluster.open-cluster-management.io/v1beta1