[issue41425] [tkinter] "Coupling Widget Variables" example missing code

[Brett Cannon]

New submission from Brett Cannon <brett at python.org>:

The example for https://docs.python.org/3.8/library/tkinter.html#coupling-widget-variables is missing:

1. Imports
2. Code to launch the example

----------
assignee: docs at python
components: Documentation
keywords: easy
messages: 374522
nosy: brett.cannon, docs at python
priority: normal
severity: normal
status: open
title: [tkinter] "Coupling Widget Variables" example missing code
versions: Python 3.10, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41425>
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