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Fix spelling mistakes in tkinter.py (#1716)

Ran the docstrings through spell checker, and fixed spelling issues.
V
Vijay Kumar committed
128641d17e8f6a3d9229e93b169b9fcc6c20d453
Parent: 89a5e03
Committed by Serhiy Storchaka <storchaka@gmail.com> on 5/22/2017, 4:23:52 PM