Is there a process for helping fix documentation? I've raised an issue, but as I'm hacking around building out our Pulumi assets, I'm happy to contribute, more than adding more issues. Are the API doc's autogenerated from the code?

We always love contributions! The API docs are autogenerated, for the most part. The https://github.com/pulumi/docs repo has more information on contributing and details on how we generate the API docs and resource docs. Hand-written docs (e.g., guides) are in a different repo.