Added return to delete(url, params, handler) docs

Author: cherez

library/src/main/java/com/loopj/android/http/AsyncHttpClient.java

@@ -1413,6 +1413,7 @@ public RequestHandle delete(Context context, String url, Header[] headers, Respo
      * @param url             the URL to send the request to.
      * @param params          additional DELETE parameters or files to send with the request.
      * @param responseHandler the response handler instance that should handle the response.
+     * @return RequestHandle of future request process
      */
     public RequestHandle delete(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
         final HttpDelete delete = new HttpDelete(getUrlWithQueryString(isUrlEncodingEnabled, url, params));