issues with docs for Jboss/Wildfly

## Describe the bug
In the docs for setting up the agent for JBoss wildlfy in Domain mode below, the directory for `domain.xml` is `domain/configuration`. However while implementing this, the correct directory path to make this work is `dcontroller/configuration` as this allows the settings to propagate out to the nodes that run the services.
https://www.elastic.co/guide/en/apm/agent/java/current/setup-javaagent.html#setup-jboss-wildfly

It would also be helpful if its specified that the `elastic-apm-agent-.jar` needs to be copied to all the nodes in the cluster.