Improve the maven repo doc so users know where to get the EAP 6 (and WFK 2) maven repo

When a user sets up EAP 6 in JBT/JBDS and tries to create one of the projects from Central without first setting up the maven repo, they are given a warning and this link:
https://community.jboss.org/wiki/SettingUpTheJBossEnterpriseRepositories

The article provides details about how to add the maven repo, but it doesn't say anything about where to get the repo and what version is needed exactly (in the future there will be EAP 6.0.0, 6.0.1, etc.).
The doc needs to be improved so it contains all necessary information for users to get it working. Especially once we have EAP 6 bundled with JBDS - then it's very possible that the users won't know where to get the maven repo.

This applies both to EAP 6 and WFK 2 maven repos.