[docs] [issue8638] Remove suggestion for name mangling from the tutorial

[Clovis Fabricio]

Clovis Fabricio <nosklo+python at gmail.com> added the comment:

I help in #python and always suggest people to not use double-underscore name mangling when they mean private. 
I agree that name mangling shouldn't be on the tutorial at all. It misleads everybody coming from other languages into thinking that it means "private" like it does in java or C++.

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nosy: +nosklo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8638>
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