Merge "Fix typo in documentation"

 * and does not constitute a generic threading framework. AsyncTasks should ideally be

 * used for short operations (a few seconds at the most.) If you need to keep threads

 * running for long periods of time, it is highly recommended you use the various APIs

 * provided by the <code>java.util.concurrent</code> pacakge such as {@link Executor},

 * provided by the <code>java.util.concurrent</code> package such as {@link Executor},

 * {@link ThreadPoolExecutor} and {@link FutureTask}.</p>

 *

 * <p>An asynchronous task is defined by a computation that runs on a background thread and