[docs] [issue27455] Fix tkinter examples to be PEP8 compliant

[Roundup Robot]

Roundup Robot added the comment:

New changeset 453a88a41a58 by Berker Peksag in branch '3.5':
Issue #27455: Improve examples in tkinter documentation
https://hg.python.org/cpython/rev/453a88a41a58

New changeset 800c069e16a0 by Berker Peksag in branch 'default':
Issue #27455: Merge from 3.5
https://hg.python.org/cpython/rev/800c069e16a0

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nosy: +python-dev

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