[docs] [issue23802] patch: __deepcopy__ memo dict argument usage

[R. David Murray]

R. David Murray added the comment:

I would rather say simply "The memo dictionary should be treated as an opaque object".  On the other hand, I doubt we will ever change the structure of the memo dict, because I'm sure that somewhere out there there is code that is *not* treating it as opaque :)

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nosy: +r.david.murray

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