[docs] [issue12183] Document behaviour of shutil.copy2 and copystat with symlinks

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I applied it because the patch is valid on 3.3 too until we actually change copystat to use lutimes.  If/when shutil is changed the doc can be updated accordingly.

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nosy: +ezio.melotti

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