Incorrect description of location of settings to control global memory usage for messaging servers

WFLY-10326 / EAP7-830 was an RFE to add settings to control global memory usage for messaging servers that was included in EAP 7.3. The docs at [1] and [2] discuss these in terms of a relationship to an 'address-settings' element, but in the management API they appear under /subsystem=messaging-activemq/server=default and in xml they are attributes of the 'journal' element.

[1]https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html-single/7.3.0_release_notes/index#messaging
[2]https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html-single/configuring_messaging/#configure_global_resource_usage_for_messaging_servers