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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e3a81a0fa14 by Senthil Kumaran in branch '2.7':
Issue #16827: Make Interpreter introduction section of the tutorial more
https://hg.python.org/cpython/rev/2e3a81a0fa14

New changeset 1e81c7a261a7 by Senthil Kumaran in branch '3.4':
Issue #16827: Make Interpreter introduction section of the tutorial more
https://hg.python.org/cpython/rev/1e81c7a261a7

New changeset ea401e7c55e4 by Senthil Kumaran in branch 'default':
merge from 3.4
https://hg.python.org/cpython/rev/ea401e7c55e4

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nosy: +python-dev

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