docs: Fix typo and broken link in AsyncTask.java

import java.util.concurrent.atomic.AtomicInteger;

/**

 * <p>AsyncTask enables proper and easy use of the UI thread. This class allows to

 * perform background operations and publish results on the UI thread without

 * <p>AsyncTask enables proper and easy use of the UI thread. This class allows you

 * to perform background operations and publish results on the UI thread without

 * having to manipulate threads and/or handlers.</p>

 *

 * <p>AsyncTask is designed to be a helper class around {@link Thread} and {@link Handler}

 * <div class="special reference">

 * <h3>Developer Guides</h3>

 * <p>For more information about using tasks and threads, read the

 * <a href="{@docRoot}guide/topics/fundamentals/processes-and-threads.html">Processes and

 * <a href="{@docRoot}guide/components/processes-and-threads.html">Processes and

 * Threads</a> developer guide.</p>

 * </div>

 *