Reporter does not report failing document in multi-documents terms

[MattiSG]

In multi-documents terms, even if only one document is failing, all source documents will be listed as to be checked. This puts unnecessary work on the maintainers and makes it harder to identify which document might actually need an update in the declaration.

For example:

• With one document failing: https://github.com/OpenTermsArchive/pga-declarations/issues/296#issuecomment-2954370249
• With several documents failing: https://github.com/OpenTermsArchive/pga-declarations/issues/205#issuecomment-2954367036