examples are calling for the module version 2.1.1, but only the 2.0.0 is available in the registry

```
$ terraform init
Initializing modules...

Error: Unresolvable module version constraint

There is no available version of module
"oracle-terraform-modules/iam/oci//modules/iam-compartment" (main.tf:41) which
matches the given version constraint. The newest available version is 2.0.0.
...
```