[issue29506] Incorrect documentation for the copy module

[R. David Murray]

R. David Murray added the comment:

Looking over the PR, and especially in the context of Serhiy's point about this being about 'deep copy' and not 'deepcopy', I think this would be clearer if it were shortened even further, to just:

"Because deep copy copies everything, it may copy data that is intended to be shared between copies."

After all, what deepcopy does it provide a way for a class to implement that sharing when a deepcopy is done.

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