Not at all, this is the latest version of the documentation. This means that it will be updated almost in sync with the latest version of the package. The version is indicated next to the title at the top left.
I always recommend to get the latest version of the asset if possible. With that said, don't worry, in general most of the concepts will remain the same. Once you understand the basics of the asset, you are good to go.
Check the "How to..." section. Consider this section as a modular "get started" guide.