I want this feature too and we should have this. One workaround is to pull the version of tvm code you want and generate the doc by yourself.
It should be fine to have documents to each release version (e.g., 0.7) because it’s one time effort and we can manually do that in each release. For the HEAD version, we can put the commit hash to the document page.
This is a good item to add to the roadmap of this release cycle.