Transformation plugins missing documentation

[rajeevkong]

Where is the problem?

https://docs.konghq.com/hub/kong-inc/request-transformer-advanced/configuration/

What happened?

In the older document you could see that the headers could be added to the request transformation advanced plugin. The information also provided how customers can reference values stored in vaults like Hashicorp or AWS secrets manager.

What did you expect to happen?

I expected to see documentation on how to set up referenced headers.

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