The chapter 7.6.1. About mod_cluster-manager Application of the Development Guide has a typo in the very last sentence:

For JBoss EAP7.0 it is also possible to use Undertow as load balancer.

There should be a space between "EAP" and "7.0". And possibly also a comma after that, but I'm not sure, so that's up to you

For JBoss EAP 7.0, it is also possible to use Undertow as load balancer.