[Hama Wiki] Trivial Update of "Combiner" by ChiaHungLin

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The "Combiner" page has been changed by ChiaHungLin:
http://wiki.apache.org/hama/Combiner?action=diff&rev1=1&rev2=2

  Combiner in Hama BSP model is used to combine messages during [[SyncService|barrier sync]] stage. This can reduce messages sent to other peers because sending messages somehow incurs overhead[1]. 
  
  == An example ==
- Combiner's usage can be seen in source code - CombinerExample.java, in which an user defined combiner - SumCombiner - sum up messages to be sent and add the result to BSPMessageBundle class. This decreases the total messages to just one IntegerMessage with a summary of all values.  
+ Combiner's usage can be seen in source code - CombinerExample.java, in which an user defined combiner, SumCombiner, sums up messages to be sent and adds the result to BSPMessageBundle class. This decreases the total messages to just one IntegerMessage with a summary of all values.  
  
  {{{
    public static class SumCombiner extends Combiner {
@@ -29, +29 @@

  
  }}}
  
- Combiner actually get called in sync function,
+ Combiner actually gets called in sync function,
  
  {{{