There is a new pull request by ericonr against master on the void-packages repository

https://github.com/ericonr/void-packages linkcheck
https://github.com/void-linux/void-packages/pull/23966

mdBook: update to 0.4.1.
Add patch to fix page index in void-docs.

A patch file from https://github.com/void-linux/void-packages/pull/23966.patch is attached