fix typo of command 'hadoop fs -help tail'
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                 Key: HADOOP-7241
                 URL: https://issues.apache.org/jira/browse/HADOOP-7241
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs, test
    Affects Versions: 0.21.0
            Reporter: Wei Yongjun
            Priority: Minor
             Fix For: site


Fix the typo of command 'hadoop fs -help tail'.

$ hadoop fs -help tail
-tail [-f] <file>:  Show the last 1KB of the file. 
                The -f option shows apended data as the file grows. 

The "apended data" should be "appended data".

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