[MJAR-176]
 - Changed documentation according to the suggestions in the
   issue.


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1602931 13f79535-47bb-0310-9956-ffa450edef68
Rewrite this page a bit, assuming this is the first time the reader uses Maven.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1602952 13f79535-47bb-0310-9956-ffa450edef68