[issue9267] Update pickle opcode documentation in pickletools for 3.x

[Alexander Belopolsky]

Changes by Alexander Belopolsky <belopolsky at users.sourceforge.net>:


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dependencies: +3.1 cannot unpickle 2.7-created pickle
nosy: +alexandre.vassalotti, lemburg, mark.dickinson, pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9267>
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