K8s: Update Node Pool documentation

[danaelhe]

Addressing #1516

Adding explicit documentation that minimum node pool size can't not be zero if autoscale is true.

[andrewsomething]

Looking at #1516, they're referencing the node-pool create sub-command. That's where the default of 0 is specified in the docs.

doctl/commands/kubernetes.go

Line 492 in 338e5dc

AddIntFlag(cmdKubeNodePoolCreate, doctl.ArgNodePoolMinNodes, "", 0,

So we probably want to update there as well.

[danaelhe]

Looking at #1516, they're referencing the node-pool create sub-command. That's where the default of 0 is specified in the docs.

doctl/commands/kubernetes.go

Line 492 in 338e5dc

AddIntFlag(cmdKubeNodePoolCreate, doctl.ArgNodePoolMinNodes, "", 0,

So we probably want to update there as well.

good catch 👍