In the EAP 8 documentation Developer guides, we only have the 'Getting Started', but in EAP 7.4 we have 5 guides.  The Guide we have in EAP 8, looks like may be the content from the EAP 7.4 Development Guide Chapter 2.

EAP 8 [1]: 

• Getting started with developing applications for JBoss EAP deployment'

These guides need to be added to 8.0 & 8.1. 

EAP 7.4 [2]:

• Development Guide
• Developing Web Services Applications
• Developing Jakarta Enterprise Beans Applications
• Developing Hibernate Applications
• Managing Transactions on JBoss EAP

[1] https://docs.redhat.com/en/documentation/red_hat_jboss_enterprise_application_platform/8.0#Development

[2] https://docs.redhat.com/en/documentation/red_hat_jboss_enterprise_application_platform/7.4#Development