ACCUMULO-1470 updated documentation for logger.dir.walog

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1487649 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1470 updated documentation for logger.dir.walog

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1487650 13f79535-47bb-0310-9956-ffa450edef68