[docs] [issue28810] Document bytecode changes in 3.6

[Brett Cannon]

Brett Cannon added the comment:


New changeset 4b2a2a425a906c8e4eb8daee14ab1793e225f726 by Brett Cannon (Ivan Levkivskyi) in branch 'master':
bpo-28810: Document changes to CALL_FUNCTION opcodes (GH-250)
https://github.com/python/cpython/commit/4b2a2a425a906c8e4eb8daee14ab1793e225f726


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