Correct formatting in build.xml Ant targets help

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1638038 13f79535-47bb-0310-9956-ffa450edef68
Revert bothed commit

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1638040 13f79535-47bb-0310-9956-ffa450edef68