small fix in comment

bench/spdlog-bench-mt.cpp

@@ -17,7 +17,7 @@ int main(int argc, char* argv[])
     int howmany = 1000000;
 
     namespace spd = spdlog;
-    ///Create a file rotating logger with 5mb size max and 3 rotated files
+    ///Create a file rotating logger with 5mb size max and 5 rotated files
     auto logger = spd::rotating_logger_mt("file_logger", "logs/spd-sample", 10 *1024 * 1024 , 5);
 
     logger->set_pattern("[%Y-%b-%d %T.%e]: %v");