[docs] [issue14097] Improve the "introduction" page of the tutorial

[Roundup Robot]

Roundup Robot added the comment:

New changeset 438da6ae38fa by Zachary Ware in branch '2.7':
Issue #14097: Backport 796d1371605d and subsequent changes.
http://hg.python.org/cpython/rev/438da6ae38fa

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14097>
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