actually update toc

Signed-off-by: lauralorenz <lauralorenz@google.com>

Author: lauralorenz

keps/sig-multicluster/2149-clusterid/README.md

@@ -103,7 +103,8 @@ tags, and then generate with `hack/update-toc.sh`.
       - [Contents](#contents-1)
       - [Consumers](#consumers-1)
   - [Additional Properties](#additional-properties)
-  - [Notes/Constraints/Caveats (Optional)](#notesconstraintscaveats-optional)
+  - [Notes/Constraints/Caveats](#notesconstraintscaveats)
+    - [Note: On ClusterProperty.value max length validation](#note-on-clusterpropertyvalue-max-length-validation)
   - [Risks and Mitigations](#risks-and-mitigations)
 - [Design Details](#design-details)
   - [Rationale behind the <code>ClusterProperty</code> CRD](#rationale-behind-the--crd)