[docs] [issue33442] Python 3 doc sidebar dosnt follow page scrolling like 2.7 doc sidebar.

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +xtreak

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33442>
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