- Fix comment describing new test.

lib/math/coin_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// Test that the default PRNG does converge towards Pi when doing a Monte Carlo
-// simulation.
+// Test that a coin toss with Random.nextBool() is fair.
 
 // Library tag to allow Dartium to run the test.
 #library("coin_test");
 
 #import("dart:math");
 
 main() {
   var seed = new Random().nextInt((1<<32) - 1);
   print("coin_test seed: $seed");
   var rnd = new Random();
   var heads = 0;
   var tails = 0;
   for (var i = 0; i < 10000; i++) {
     if (rnd.nextBool()) {
       heads++;
     } else {
       tails++;
     }
   }
   print("Heads: $heads\n"
         "Tails: $tails\n"
         "Ratio: ${heads/tails}\n");
   Expect.approxEquals(1.0, heads/tails, tolerance:0.1);
 }