[docs] [issue11481] The copy module already uses copyreg

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

After quite a long chat with Ezio, I'm just proposing this updated patch:

- it fixes the copy doc, explicitly acknowledging the use of copyreg functionalities
- it rewords the first paragraph of copyreg doc, which was a bit too pickle-centric
- it adds an example to copyreg, to give an initial clue of how it works.

I'd like to hear comments/suggestions about it.

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nosy: +fdrake, rhettinger
Added file: http://bugs.python.org/file22849/issue11481-v2.patch

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