[docs] [issue7057] tkinter doc: more 3.x updates

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> I used 'manN'
FYI, there is a :file:`man{n}` construct where braces mark up replaceable text, like the var element in HTML.

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nosy: +docs at python, eric.araujo -georg.brandl

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