I'd like to note that what Sphinx can't do -- or better, doesn't do at
the moment, is to output full reStructuredText documents when using
autodoc.  It directly integrates the docstrings into the doctree that
will become the output.

So, for the Python documentation itself, where we do not want to use
autodoc (it would be nice, but would require that the documentation be
built using the version of Python that is documented, which is e.g.
currently impossible in the case of 3.x), this is of no great help.