Improve WildFly quickstart documentation

Trying to build the example here ...

https://github.com/jbosstm/quickstart/tree/master/wildfly/setCheckedActionFactoryExample

The pom refers to a version of JTA that isn't in the repo, so it fails.

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 19.553 s
[INFO] Finished at: 2015-12-24T15:30:31+00:00
[INFO] Final Memory: 8M/149M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project setCheckedActionFactoryExample: Could not resolve dependencies for project org.jboss.narayana:setCheckedActionFactoryExample:war:0.0.1-SNAPSHOT: Could not find artifact org.jboss.narayana.jta:jta:jar:5.2.12.Final-SNAPSHOT in jboss-public-repository-group (https://repository.jboss.org/nexus/content/groups/public/) -> [Help 1]

Changing to 5.2.9.Final at least lets the example build (and hopefully run).