[issue16701] Docs missing the behavior of += (in-place add) for lists.

[Roundup Robot]

Roundup Robot added the comment:

New changeset ec373d762213 by Martin Panter in branch '2.7':
Issue #16701: Document += and *= for mutable sequences
https://hg.python.org/cpython/rev/ec373d762213

New changeset f83db23bec7f by Martin Panter in branch '3.4':
Issue #16701: Document += and *= for mutable sequences
https://hg.python.org/cpython/rev/f83db23bec7f

New changeset 6e43a3833293 by Martin Panter in branch '3.5':
Issue #16701: Merge sequence docs from 3.4 into 3.5
https://hg.python.org/cpython/rev/6e43a3833293

New changeset a92466bf16cc by Martin Panter in branch 'default':
Issue #16701: Merge sequence docs from 3.5
https://hg.python.org/cpython/rev/a92466bf16cc

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nosy: +python-dev

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