D comes with an interesting utility called `dman`. Run it from the command line and as an argument give it a D topic and it'll open a browser on the topic.
dman dman
will, of course, open the browser on a page about dman.
Which, as I noted, is still a very different experience from go/nim/rust in Debian. It wasn't a pet peeve about no documentation, it is about how I can interact with it compared to to other languages.