Since after closing of issue #10199, docstrings in demo scripts are accessible to pydoc, it is important to bring them up to date. For example, turtledemo.wikipedia docstring contains a reference to nonexistent wikipedia1 and calls itself tdemo_wikipedia3.py.
In addition, the turtledemo package contains three text files: Lib/turtledemo/about_turtle.txt, Lib/turtledemo/about_turtledemo.txt, and Lib/turtledemo/demohelp.txt. The contents of these files should be moved to appropriate (doc)strings inside appropriate .py files.