Add documentation describing use of multiple connectors with EJB client

I wasn't able to locate any documentation of the fact that multiple connectors may be enabled to receive EJB invocations (see WFLY-13132) in the EAP docs.

For the record,here are the docs for EAP 7.4:

• Release Notes
• JBoss Enterprise Application Platform Expansion Pack
  • RedHat JBoss EAP XP 3.0.0 Release Notes
  • JBoss EAP XP Upgrade and Migration Guide
  • Using Microprofile with JBoss EAP XP 3.0.0
  • JBoss EAP XP 3.0.0 Quickstarts
• Deployment
  • JBoss EAP Quickstarts
  • Introduction to JBoss EAP
  • Getting Started Guide
  • Getting Started with JBoss EAP for OpenShift Online
  • Getting Started with JBoss EAP for OpenShift Container Platform
• Installation and Upgrade
  • Installation Guide
  • Migration Guide
  • Patching and Upgrading Guide
  • Using the JBoss Server Migration Tool
• Development
  • Development Guide
  • Developing Web Services Applications
  • Developing Jakarta Enterprise Beans Applications
  • Developing Hibernate Applications
  • Managing Transactions in JBoss EAP
• Configuration and Maintenance
  • Configuration Guide
  • Configuring Messaging
• Security
  • Security Architecture
  • How to Configure Server Security
  • How to Configure Identity management
  • How to set up SSO with SAML v2
  • How to set up SSO with Kerberos
• Cloud
  • JBoss EAP Management Model
  • Using JBoss EAP in Microsoft Azure
  • Deploying JBoss EAP on AWS
• Reference
  • Management CLI Guide
  • Login Module Reference
  • Performance Tuning Guide
  • API Javadocs

This issue involves using the EJB client to access EJB deployments via multiple connectors on the server, and so relates most directly to configuration of the EJB subsystem.

So, the documents potentially relevant to this issue are Development Guide (mentions configuring EJB client), Developing Jakarta Enterprise Beans Applications (describes invoking EJBs as well as clustered EJBs), the Configuration Guide (describes configuration of many of the subsystems, but not for the EJB subsystem) and the Migration Guide (as this was a configuration change from EAP 7.3 to EAP 7.4).

In the guide Developing Jakarta Enterprise Beans Applications, Section 5.4 Enterprise Beans Client Remoting Interoperability deals with how to set up connectors to facilitate EJB client interaction with the server. This might be an appropriate place to add some pointers about configuring EJB client on multiple ports: the fact that it can be done, and how to add any extra Remoting connectors and adjust the EJB3 subsystem configuration to get the job done.