Description of checking of admin-mode is wrong in configuration guide

Description of checking of admin-mode is wrong in configuration guide. Command /core-service=server-environment:read-attribute(name=initial-running-mode) returns first running mode. It don't return current running mode. "running mode" can be changed by ":reload(admin-only=true)" or ":reload(admin-only=false)".

This description is part of "2.3. Running JBoss EAP in Admin-Only Mode" chapter in part starts with "Check If JBoss EAP is Running in Admin-Only Mode".

Steps to Reproduce:

1. ./standalone.sh --admin-only
2. :reload(admin-only=false)
3. /core-service=server-environment:read-attribute(name=initial-running-mode)
   • "result" => "ADMIN_ONLY"