[issue30913] IDLE: Document tk Vars, attributes, methods by tab page

[Cheryl Sabella]

Cheryl Sabella added the comment:

Did you want me to do other PRs for this?  I had intended that one to be the first and I would complete more information on a subsequent PR, but you've added a lot of info.

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<http://bugs.python.org/issue30913>
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