[docs] [issue26213] Document BUILD_*_UNPACK opcodes

[Brett Cannon]

Brett Cannon added the comment:


New changeset 226af23e858e2914cf78dfa6fd441c7b90a4cc91 by Brett Cannon in branch '3.6':
bpo-26213: Document _UNPACK bytecodes and BUILD_MAP changes (GH-440)
https://github.com/python/cpython/commit/226af23e858e2914cf78dfa6fd441c7b90a4cc91


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<http://bugs.python.org/issue26213>
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