[docs] [issue28810] Document bytecode changes in 3.6

[Brett Cannon]

Brett Cannon added the comment:


New changeset 68c5e4c592495f1e0f4f60acb3483beb6aa87be1 by Brett Cannon in branch '3.6':
bpo-28810: Document BUILD_TUPLE_UNPACK_WITH_CALL bytecode (GH-605)
https://github.com/python/cpython/commit/68c5e4c592495f1e0f4f60acb3483beb6aa87be1


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