docs: Two-page notification fix.

        .setStyle(secondPageStyle)

        .build();

// Add second page with wearable extender and extend the main notification

Notification twoPageNotification =

        new WearableExtender()

                .addPage(secondPageNotification)

                .extend(notificationBuilder)

// Extend the notification builder with the second page

Notification notification = notificationBuilder

        .extend(new NotificationCompat.WearableExtender()

                .addPage(secondPageNotification))

        .build();

// Issue the notification

notificationManager =

        NotificationManagerCompat.from(this);

notificationManager.notify(notificationId, twoPageNotification);

notificationManager.notify(notificationId, notification);

</pre>

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