Improve documentation about upstream provider example string

[stooj]

Hello!

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Issue details

The setup.sh script expects an upstream address for the upstream go module, and as an example suggests hashicorp/terraform-aws.

This example doesn't work:

go.mod:12:2: malformed module path "hashicorp/terraform-provider-aws": missing dot in first path element
Error occurred at ./setup.sh:175. Run with verbose '-v' flag to enable command logging.

I think this string should actually be whatever would work with go get (eg github.com/hashicorp/terraform-aws). Including the whole path will make it clearer how to adapt the example to whatever I'm trying to bridge.

Affected area/feature

• Setup script