Request: documents should link what they document

My concrete example is the [module verification report](https://eclipse-score.github.io/module_template/main/verification_report/module_verification_report.html)

Currently the analyzed module can be determined from the id only, or from being in the same repository. While that is theoretically enough for traceability, a more explicit link would help traceability tooling.

Proposal: extend [document](https://eclipse-score.github.io/docs-as-code/main/reference/metamodel/index.html#document) with a `documents` or `affects` or `belongs_to` links or similar, which would link to the `mod` in question.

This will also establish a backlink from modules to module verification reports.

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Todays workaround is a custom type which has such a link. This allows automated generation of such reports.