[docs] [issue29506] Incorrect documentation for the copy module

[Zachary Ware]

Zachary Ware added the comment:

That line is correct, the point is that deep copy will duplicate even the things that you may *want* to be shared.

See also #27416.  I'm not sure what we can do to further clarify that line, but it is certainly easy to misread.

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nosy: +zach.ware

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