A --location flag seems to be required for some Azure k8s setup steps

[danielballan]

Thank for maintaining this excellent guide, which has been reliably useful to me, year after year!

Bug description

When following Step Zero for Azure I get this error message for az network vnet create:

(LocationNotAvailableForResourceType) The provided location 'unitedstates' is not available for resource type 'Microsoft.Network/virtualNetworks'.

and similarly for az aks create:

The provided location 'unitedstates' is not available for resource type 'Microsoft.ContainerService/managedClusters'. 

Proposed solution

Adding the --location flag, consistently with what I used for az group create, addresses the issue. Perhaps the documentation should be updated to set a $LOCATION and then use that throughout? I would be happy to open a PR if you think this makes sense.

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