[Nutch Wiki] Trivial Update of "bin/nutch datanode" by RobPettengill

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The following page has been changed by RobPettengill:
http://wiki.apache.org/nutch/bin/nutch_datanode

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  The NDFS class holds the NDFS client and server.
  
- DataNode controls just one critical table: block-> BLOCK_SIZE stream of bytes
+ !DataNode controls just one critical table: block-> BLOCK_SIZE stream of bytes
  
- This info is stored on disk (the NameNode is responsible for asking other machines to replicate the data). The DataNode reports the table's contents to the NameNode upon startup and every so often afterwards.
+ This info is stored on disk (the !NameNode is responsible for asking other machines to replicate the data). The !DataNode reports the table's contents to the NameNode upon startup and every so often afterwards.
  
  Usage: bin/nutch net.nutch.ndfs.NDFS <dataDir> <localMachine> <namenode:port>