Add notes comment for isBinderAlive API, to warn developers who use this...

    public native boolean pingBinder();

    /**

     * Check to see if the process that the binder is in is still alive.

     *

     * Note, this only reflects the last known death state, if the object

     * is linked to death or has made a transactions since the death occurs.

     *

     * @return false if the hosting process is gone

     */

    public native boolean isBinderAlive();