Fix typo in docs of subscription (#826)

Author: rogierslag

website/docs/docs/subscription.md

@@ -44,7 +44,7 @@ Notifications.ios.checkPermissions().then((currentPermissions) => {
     console.log('Alerts enabled: ' + !!currentPermissions.alert);
     console.log('Car Play enabled: ' + !!currentPermissions.carPlay);
     console.log('Critical Alerts enabled: ' + !!currentPermissions.criticalAlert);
-    console.log('Provisioanl enabled: ' + !!currentPermissions.provisional);
+    console.log('Provisional enabled: ' + !!currentPermissions.provisional);
     console.log('Provides App Notification Settings enabled: ' + !!currentPermissions.providesAppNotificationSettings);
 	console.log('Announcement enabled: ' + !!currentPermissions.announcement);
 });