Clarify order of operations in vertical scaling

Particularly in development/staging use cases, it's plausible that you'd want to increase the resource allocations for your pods, and increase the CB Quotas to take advantage of these. E.g.:

Quota 256Mi -> 512Mi
Mem request/limit 512Mi -> 1024Mi

Conceptually, it makes sense to make these changes to the cluster resource and apply it, as the before and after states will both be valid. This fails however, as the operator is unaware of the dependancy between the two - it will try to swap in new pods with the higher resources, but it will also try to apply the new quota immediately. This will then fail, because the cluster is still made up of old pods and can't handle the new quota yet.

It's potentially not the most common use case, but it's probably worth caveating. Maybe under https://docs.couchbase.com/operator/2.0/howto-couchbase-scale.html ?