Boost Python Tutorial contains broken link to Python Tutorial

The [Boost Python Tutorial](https://github.com/boostorg/python/blob/develop/doc/tutorial.qbk#L1657) references a Python Tutorial in the **Creating Packages** section. The link to said Python Tutorial `http://www.python.org/doc/current/tut/node8.html` shows a 404 File Not Found page.

I don't know to which content in the Python Tutorial the **Creating Packages** section in the Boost Python Tutoral was referring to, but found a Python Tutorial on **Packaging Python Projects** under this url `https://packaging.python.org/en/latest/tutorials/packaging-projects/#`