Chapter 1. New Features and Enhancements of the Release Notes has a Clustering section which gained a Note that points to "Deploying Clustered EJBs" in Developing EJB Applications.

This is more misleading than helpful. There is no single chapter that would be useful as a target of "see this for more info about clustering". You'd have to refer at least to these 3 chapters, maybe more:

• Chapter 7. Clustering in Web Applications in Dev Guide
• Chapter 8. Clustered Enterprise JavaBeans of the EJB Dev Guide
• Chapter 21. Configuring High Availability in the Config Guide

My suggestion: remove the Note altogether, or refer to all of these topics. No personal preference, really.