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

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

How about

```
Because deep copy copies everything, it may copy too much, including the administrative data structures.
```

?

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nosy: +Mariatta

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29506>
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