Fix typos in doc-string.

sdk/lib/io/platform.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.
 
 part of dart.io;
 
 /**
  * Information about the environment in which the current program is running.
  *
  * Platform provides information such as the operating system,
@@ skipping 35 matching lines @@
  * [operatingSystem] getter. You can also use one of the static boolean
  * getters: [isMacOS], [isLinux], and [isWindows].
  *
  *     import 'dart:io' show Platform, stdout;
  *
  *     void main() {
  *       // Get the operating system as a string.
  *       String os = Platform.operatingSystem;
  *       // Or, use a predicate getter.
  *       if (Platform.isMacOS) {
- *         Print('is a Mac'); 
+ *         print('is a Mac'); 
  *       } else {
- *        print('is not a Mac');
+ *         print('is not a Mac');
  *       }
  *     }
  *
  * ## Other resources
  *
  * [Dart by Example](https://www.dartlang.org/dart-by-example/#dart-io-and-command-line-apps)
  * provides additional task-oriented code samples that show how to use 
  * various API from the [dart:io] library.
  */
 class Platform {
@@ skipping 103 matching lines @@
    *
    * If there is no --package-root flag, then the empty string is returned.
    */
   static String get packageRoot => _Platform.packageRoot;
 
   /**
    * Returns the version of the current Dart runtime.
    */
   static String get version => _version;
 }