Add missed decription for log-commits option

spike_main/spike.cc

@@ -50,6 +50,7 @@ static void help(int exit_code = 1)
   fprintf(stderr, "                          This flag can be used multiple times.\n");
   fprintf(stderr, "                          The extlib flag for the library must come first.\n");
   fprintf(stderr, "  --log-cache-miss      Generate a log of cache miss\n");
+  fprintf(stderr, "  --log-commits         Generate a log of commits info\n");
   fprintf(stderr, "  --extension=<name>    Specify RoCC Extension\n");
   fprintf(stderr, "                          This flag can be used multiple times.\n");
   fprintf(stderr, "  --extlib=<name>       Shared library to load\n");