Fix ambigous typos.

tools/ddbg_service/lib/debugger.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.
 
 library debugger;
 
 import "dart:async";
 import "dart:io";
 
 import "package:ddbg/commando.dart";
@@ skipping 142 matching lines @@
     var matches  = _commands.match(command, true);
     if (matches.length == 0) {
       huh();
       cmdo.show();
     } else if (matches.length == 1) {
       matches[0].run(this, args).then((_) {
           cmdo.show();
         });
     } else {
       var matchNames = matches.map((handler) => handler.name);
-      cmdo.print("Ambigous command '$command' : ${matchNames.toList()}");
+      cmdo.print("Ambiguous command '$command' : ${matchNames.toList()}");
       cmdo.show();
     }
   }
 
 }
 
 // Every debugger command extends this base class.
 abstract class Command {
   String get name;
   String get helpShort;
@@ skipping 295 matching lines @@
 
   Future run(Debugger debugger, List<String> args) {
     var cmdo = debugger.cmdo;
     if (args.length > 1) {
       cmdo.print("Unexpected arguments to $name command.");
       return new Future.value();
     }
     return debugger.quit();
   }
 }