[docs] [issue26213] Document BUILD_*_UNPACK opcodes

[Brett Cannon]

Brett Cannon added the comment:

There are also BUILD_SET_UNPACK and BUILD_MAP_UNPACK as well.

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title: Document BUILD_LIST_UNPACK & BUILD_TUPLE_UNPACK -> Document BUILD_*_UNPACK opcodes

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26213>
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