Fix a broken docs link.

    /**

     * Called on a worker thread to perform the actual load. Implementations should not deliver the

     * results directly, but should return them from this method and deliver them from

     * {@link #onPostExecute()}

     * results directly, but should return them from this method, which will eventually end up

     * calling {@link #deliverResult(Object)} on the UI thread. If implementations need to process 

     * the results on the UI thread they may override {@link #deliverResult(Object)} and do so

     * there.

     *

     * @return the result of the load

     */