tkinter (part of the standard library) appears to have several undocumented modules, but these are not listed in the "undocumented modules" page in the Python documentation. What's going on?

In my experience, Python has always had extremely good documentation, so I'm surprised to be running into this. But on the tkinter-modules documentation page, it seems that there is no documentation for several modules: colorchooser, commondialog, etc. I found that there is a Python documentation page listing which modules are undocumented, but I don't see these tk modules on there.

Now I'm just feeling a bit confused and annoyed. Am I misunderstanding something, is this a problem, and/or have I found myself in some little-used part of the standard library that no one has found the time to clean up? Can I expect to run into this problem with any other standard library modules?