This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
If you upgrade your TYPO3 installation from 4.x to 6.2 / 7 / 8 you should upgrade this extension to v1.1.x. There shouldn't be breaking changes. But as always be careful and don't forget to backup all related stuff.
On the other hand, don't upgrade to 0.2.0 or 1.x.x, if your TYPO3 installation still is from the 4.5+ branches.