Adjust HTTP Request docs.

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

 // 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 $LIBRARYNAME;
 
 /**
  * A utility for retrieving data from a URL.
  *
  * HttpRequest can be used to obtain data from http, ftp, and file
@@ skipping 69 matching lines @@
     requestHeaders.putIfAbsent('Content-Type',
         () => 'application/x-www-form-urlencoded; charset=UTF-8');
 
     return request(url, method: 'POST', withCredentials: withCredentials,
         responseType: responseType,
         requestHeaders: requestHeaders, sendData: formData,
         onProgress: onProgress);
   }
 
   /**
-   * Creates a URL request for the specified [url].
+   * Creates and sends a URL request for the specified [url].
    *
    * By default `request` will perform an HTTP GET request, but a different
    * method (`POST`, `PUT`, `DELETE`, etc) can be used by specifying the 
    * [method] parameter.
    *
    * The Future is completed when the response is available.
    *
    * If specified, `sendData` will send data in the form of a [ByteBuffer],
    * [Blob], [Document], [String], or [FormData] along with the HttpRequest.
    *
@@ skipping 166 matching lines @@
     } else {
       JS('', '#.send()', xhr);
     }
 
     return completer.future;
 $endif
   }
 
 $!MEMBERS
 }