thank you for your feedback on this! The links that don't contain a version number always redirected to the latest version of the documentation up until Kentico 7. The links pointed to the appropriate page in the newest version.
With the change to Kentico 8 and the restructuring of the documentation, this was no longer possible, as some pages were merged, some pages were split into more, and majority of pages were renamed. With the redirect, we wanted to provide readers with a way to look up the information in the newest documentation.
However, seeing your and others' feedback, we will abandon the redirection and let the links point to Kentico 7 documentation.
I hope this makes sense to you. I'll appreciate further comments on this issue or on the documentation in general.
Documentation & Training Program Manager