http://webcolors.readthedocs.io/
Once upon a time, the entire library's documentation was generated from docstrings in the code, but the library very quickly outgrew that as I needed to do things like:
* How to install the library and how to run the tests
* Properly explain the web color model and the history of how it's been implemented in the specifications
* Properly explain how the various ways to specify colors get represented as Python types
* Explain how Python 2/3 compatibility is handled
etc., etc.
There are a ton of things that don't naturally attach to just one function or class, but need to be in the documentation. The hacky compromise solution is a module-level docstring, but now people who want to read source have to scroll through a huge amount of stuff before they see a single line of actual code.
So I'm going to stay far away from auto-generated documentation and "just put it in comments/docstring/etc." for the foreseeable future.