Note removal of org.jboss.spec.javax.rmi:jboss-rmi-api_1.0_spec in the EAP Migration Guide

With WFLY-12416 the org.jboss.spec.javax.rmi:jboss-rmi-api_1.0_spec artifact was removed from the server dependency management which will result in its removal from the jboss-jakartaee-8.0 bom. This task is to note this in the migration guide. User applications that had a dependency on this artifact in their pom can remove the dependency, as the classes in this artifact are available from the JDK.