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

[Nick Coghlan]

Nick Coghlan added the comment:

I'm going to merge Sanyam's PR as-is, as while David's reformulation shorten the overall sentence, it complicates the core description of the problem (copying things that you didn't want copied) by merging it with the stereotypical example of why you might not want to copy something (i.e. you intended to share a common reference between otherwise independent copies).

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<http://bugs.python.org/issue29506>
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