Fixed usage message

main.ml

@@ -64,11 +64,11 @@ let parse_args () =
     ("-noopt", Arg.Unit (fun _ -> Globals.args.optimize <- false),
              "   Disable optimization");
     ("-opt", Arg.Unit (fun _ -> Globals.args.optimize <- true),
-           "     Enable optimization (overwrite earlier -nocpp)");
+           "     Enable optimization (overwrite earlier -noopt)");
 
     ("-upto", Arg.String (fun s -> Globals.args.endphase <- s),
             "<phase> Stop after the specified phase, and print the intermediate \
-             representation to stderr.\n        \
+             representation to stderr.\n            \
              Possible options are (in order of execution):" ^ upto_usage phases);
   ] in