[docs] [issue13791] Reword “Old versions” in the doc sidebar

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I believe this should be closed in favor of #13122. The sidebar needs more change than just this one thing. See my proposal for a version-independent sidebar in msg150907, which Georg B. approved of.

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<http://bugs.python.org/issue13791>
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