[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=15&rev2=16

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    transport->open();
    DocInstance doc;
    if (argc == 2) {
+     uint32_t docid(atoi(argv[1]));
-     client.get(doc, atoi(argv[1]));
+     client.get(doc, docid);
      // do something (important) with 'doc' now
    }
    transport->close();