Incomplete tooling documentation

For tooling the docs defer to the wildfly/EAP cli for "5.1.1. Browse and Manage Transactions Using an Application Server". We had some text in the README explaining how to view the tooling MBeans but the equivalent needs to be added to the development_guide too for use with standalone narayana.

In addition the docs need to explain how to extend the tooling for new abstract records (basically the user needs to create a JMX MBean for the new type and register it with the ObjStoreBrowser).