Testing the documentation examples is a long term goal, which people occasionally contribute to.  I think there is an open issue about using the Sphinx doctest support, that for a long time was blocked by the documentation tool chain not using python3.  Some examples are very hard to run in an automated fashion, as well.  Perhaps the examples can be tweaked...but in some cases they can't, without losing their teaching value.  I have a feeling the multiprocessing examples fall into this category, as I seem to remember doing a pass of testing of them a (python3) release or two ago.  I did not test them on windows, though.