Fix comment in AudioManager

    /**

     * The message sent to apps when the contents of the device list changes if they provide

     * a {@link Handler} object to addOnAudioDeviceConnectionListener().

     * a {@link Handler} object to {@link registerAudioDeviceCallback}.

     */

    private final static int MSG_DEVICES_CALLBACK_REGISTERED = 0;

    private final static int MSG_DEVICES_DEVICES_ADDED = 1;