Clarify correct use of module outputs in documentation

[alexjmoore]

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Description

I might have missed it, but I can't find any clear docs around how to reference module outputs, to the point where I almost submitted a bug as I was simply referencing parameters set in a module and I could see it was synthing a string rather than a reference (and so causing me dependency issues - or lack of).

However, now my understanding is that you would do something like (in python):

modulevarname.paramname_output

i.e. add _output to the parameter name that the module is outputting? a) is that correct? (as I think it is from testing and digging around the generated module python code) and b) could some guidance on this point be added to the [using-providers-and-modules.md](https://github.com/hashicorp/terraform-cdk/blob/main/docs/working-with-cdk-for-terraform/using-providers-and-modules.md)

If I am completely doing it wrong, it would be also good to know :-)

Thanks!

[jsteinich]

i.e. add _output to the parameter name that the module is outputting?

This is correct for python. For other languages it is

`${toCamelCase(output.name)}Output`

[github-actions]

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