[Thrift Wiki] Update of "ThriftUsageC++" by DaleJohnson

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The "ThriftUsageC++" page has been changed by DaleJohnson.
http://wiki.apache.org/thrift/ThriftUsageC%2B%2B?action=diff&rev1=14&rev2=15

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    DocRetrievalClient client(protocol);
    transport->open();
    DocInstance doc;
-   if (argc == 2)
+   if (argc == 2) {
      client.get(doc, atoi(argv[1]));
+     // do something (important) with 'doc' now
+   }
    transport->close();
  
    return 0;