Fix typos in docs

sdk/lib/io/process.dart

 // Copyright (c) 2014, 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;
 
 // TODO(ager): The only reason for this class is that we
 // cannot patch a top-level at this point.
 class _ProcessUtils {
   external static void _exit(int status);
@@ skipping 427 matching lines @@
    * Exit code for the process.
    *
    * See [Process.exitCode] for more information in the exit code
    * value.
    */
   final int exitCode;
 
   /**
    * Standard output from the process. The value used for the
    * `stdoutEncoding` argument to `Process.run` determines the type. If
-   * `null` was used this value is of type `List<int> otherwise it is
+   * `null` was used this value is of type `List<int>` otherwise it is
    * of type `String`.
    */
   final stdout;
 
   /**
    * Standard error from the process. The value used for the
    * `stderrEncoding` argument to `Process.run` determines the type. If
-   * `null` was used this value is of type `List<int>
+   * `null` was used this value is of type `List<int>`
    * otherwise it is of type `String`.
    */
   final stderr;
 
   /**
    * Process id of the process.
    */
   final int pid;
 
   ProcessResult(this.pid, this.exitCode, this.stdout, this.stderr);
@@ skipping 105 matching lines @@
   final int errorCode;
 
   const ProcessException(this.executable, this.arguments, [this.message = "",
                          this.errorCode = 0]);
   String toString() {
     var msg = (message == null) ? 'OS error code: $errorCode' : message;
     var args = arguments.join(' ');
     return "ProcessException: $msg\n  Command: $executable $args";
   }
 }