[docs] [issue16827] Remove the relatively advanced content from section 2 in tutorial

[Ezio Melotti]

Ezio Melotti added the comment:

Those section could be moved to an appendix or somewhere near http://docs.python.org/3/tutorial/interactive.html.  Note that this page and the one about float issues could be appendices too.

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<http://bugs.python.org/issue16827>
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