Fix some bad documentation links.

sdk/lib/convert/json.dart

 // Copyright (c) 2013, 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.convert;
 
 /**
  * Error thrown by JSON serialization if an object cannot be serialized.
  *
  * The [unsupportedObject] field holds that object that failed to be serialized.
@@ skipping 16 matching lines @@
       return "Converting object to an encodable object failed.";
     } else {
       return "Converting object did not return an encodable object.";
     }
   }
 }
 
 /**
  * Reports that an object could not be stringified due to cyclic references.
  *
- * An object that references itself cannot be serialized by [stringify].
+ * An object that references itself cannot be serialized by
+ * [JsonCodec.encode]/[JsonEncoder.convert].
  * When the cycle is detected, a [JsonCyclicError] is thrown.
  */
 class JsonCyclicError extends JsonUnsupportedObjectError {
   /** The first object that was detected as part of a cycle. */
   JsonCyclicError(Object object) : super(object);
   String toString() => "Cyclic error in JSON stringify";
 }
 
 /**
  * An instance of the default implementation of the [JsonCodec].
@@ skipping 1001 matching lines @@
         buffer.setRange(index, end, indent);
         index = end;
       } else {
         for (int i = 0; i < indentLength; i++) {
           writeByte(indent[i]);
         }
       }
     }
   }
 }