[routes]: README documentation link returns 404

The link to the Routes client library documentation in the README returns a 404:

https://github.com/googleapis/google-cloud-java/blob/f89e45a3d72d85e8ec9720f54b8bf36de1a4e332/java-maps-routing/README.md?plain=1#L185

I can't find the client library documentation for this product. It's very well Google recommending I use this over the Directions API, but it's a bit hard to do that as it stands. 🙃