[docs] [issue27370] Inconsistency in docs for list.extend

[Roundup Robot]

Roundup Robot added the comment:

New changeset c91007ab3fda by Martin Panter in branch '2.7':
Issue #27370: Use t for an iterable in mutable sequence ops
https://hg.python.org/cpython/rev/c91007ab3fda

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nosy: +python-dev

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<http://bugs.python.org/issue27370>
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