Add "How to handle instance reboot in cloud" to section 4.6. Using Couchbase in the Cloud

Hi,

User in Amazon AWS often gets notification that one instance needs reboot due to maintenance. It might be a good idea to provide user an official recommendation in documentation. The point of the recommendation is to save customer from any downtime during the instance reboot. Here is a draft for the steps user needs to perform:

1). Install couchbase on the new node
2). From UI, add the new node to cluster.
3). From UI, remobe the node that you wish to reboot
4). Rebalance the cluster.
5). Shut down the instance

Please let me know if you need more information.

Thanks
Larry