Currently, the different errors and warnings to encourage users to edit further the initial translations (T190279, T190283, T221359) include a "learn more" link that points to some temporary pages.
Now that the documentation page has been completed about this topic, the link should be updated to point to https://www.mediawiki.org/wiki/Help:Content_translation/Translating/Translation_quality
When the documentation is available in the current language, that language specific version should be open.