Remove useless comment

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1574444 13f79535-47bb-0310-9956-ffa450edef68
HAMA-884: Add Combiners and Aggregators API guide to website

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update website

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HAMA-885: Semi-Clustering Algorithm implementation is not producing expected output

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update change file

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update CHANGES.txt

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Merge branch 'trunk' of https://github.com/apache/hama into trunk