Fix typos in correction messages

pkg/analyzer/lib/src/dart/error/hint_codes.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 analyzer.src.dart.error.hint_codes;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 
 /**
@@ skipping 361 matching lines @@
    * [StaticTypeWarningCode.UNDEFINED_METHOD] would have been generated, if we
    * used propagated information for the warnings.
    *
    * Parameters:
    * 0: the name of the method that is undefined
    * 1: the resolved type name that the method lookup is happening on
    */
   static const HintCode UNDEFINED_METHOD = const HintCode(
       'UNDEFINED_METHOD',
       "The method '{0}' isn't defined for the class '{1}'.",
-      "Try correcting the name to the name of an existing method, or"
+      "Try correcting the name to the name of an existing method, or "
       "defining a method named '{0}'.");
 
   /**
    * This hint is generated anywhere where the
    * [StaticTypeWarningCode.UNDEFINED_OPERATOR] would have been generated, if we
    * used propagated information for the warnings.
    *
    * Parameters:
    * 0: the name of the operator
    * 1: the name of the enclosing type where the operator is being looked for
@@ skipping 169 matching lines @@
    */
   const HintCode(String name, String message, [String correction])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => ErrorType.HINT.severity;
 
   @override
   ErrorType get type => ErrorType.HINT;
 }