[DOCS] Update the Example Inputs and Outputs now based on the entrypoint way of evaluation

[Parsifal-M]

Description The docs need updating as we do not use "decision" necessarily anymore, just the result

Additional context Should be updated before next release.

Files are here: https://github.com/Parsifal-M/backstage-opa-plugins/blob/main/docs/example-inputs-outputs.md