MAPREDUCE-3310. Addendum fixing javadocs warnings (tucu)

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HDFS-5685. DistCp will fail to copy with -delete switch. Contributed by Yongjun Zhang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1556082 13f79535-47bb-0310-9956-ffa450edef68