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

[Senthil Kumaran]

Senthil Kumaran added the comment:

+1 from me as well. I am also adding Eric who might have views on the customization part which added by him.

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nosy: +eric.araujo, orsenthil

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16827>
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