Update g2log-bench-mt.cpp

bench/g2log-bench-mt.cpp

@@ -32,7 +32,7 @@ int main(int argc, char* argv[])
             {
                 int counter = ++msg_counter;
                 if (counter > howmany) break;
-                LOG(INFO) << "glog message #" << counter << ": This is some text for your pleasure";
+                LOG(INFO) << "g2log message #" << counter << ": This is some text for your pleasure";
             }
         }));
     }