fix documentation

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1443264 13f79535-47bb-0310-9956-ffa450edef68
dont use a default directory inside data for repositories content

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1443265 13f79535-47bb-0310-9956-ffa450edef68