standalone.xml should be marked as default configuration in configuration guide and getting started guide

standalone.xml should be marked as default configuration in configuration guide and getting started guide. Same for domain.xml. Also other configuration could be used with EAP.

• getting started guide
  • Chapter "2.3. JBoss EAP Management"
• Configuration guide
  • Chapter 3. JBoss EAP Management

Original text:
JBoss EAP uses a simplified configuration, with one configuration file per standalone server or managed domain. Configuration for a standalone server is stored in the EAP_HOME/standalone/configuration/standalone.xml file and configuration for a managed domain is stored in the EAP_HOME/domain/configuration/domain.xml file. Additionally, the configuration for each host controller in a managed domain is stored in the EAP_HOME/domain/configuration/host.xml file.

New text:
JBoss EAP uses a simplified configuration, with one configuration file per standalone server or managed domain. Default configuration for a standalone server is stored in the EAP_HOME/standalone/configuration/standalone.xml file and default configuration for a managed domain is stored in the EAP_HOME/domain/configuration/domain.xml file. Additionally, the configuration for each host controller in a managed domain is stored in the EAP_HOME/domain/configuration/host.xml file.