update javadoc on HexDump.dump method
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                 Key: IO-189
                 URL: https://issues.apache.org/jira/browse/IO-189
             Project: Commons IO
          Issue Type: Improvement
    Affects Versions: 1.4
            Reporter: Zemian Deng


Please update the method parameter documentation on the "offset" parameter.

Current: 
  offset - its offset, whatever that might mean

It should change to:
  offset -its output(display) offset.

Also please add that this method always will consume bytes until end of input 
byte array.

It would be nice to have a overloaded method to allow stop by length.

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