[Pig Wiki] Update of "PigStreamingFunctionalSpec" by XuZhang

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The following page has been changed by XuZhang:
http://wiki.apache.org/pig/PigStreamingFunctionalSpec

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  Y = stream X through Z;
  }}}
  
- This tells pig that streaming application stored its complete output into 
file called `outputfile` in the tasks's working directory and that the content 
of that file should be deserialized into Y using MyDeserializer. 
+ This tells pig that streaming application stored its complete output into 
file called `outputfile` in the tasks's working directory and that the content 
of that file should be deserialized into Y using `MyDeserializer`. 
  
  A user can specify multiple outputs but only the first one will be 
automatically loaded; the rest would be stored in dfs using the file name 
specified in the output as absolute path: