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

[Martin Panter]

Martin Panter added the comment:

The t vs x mixup was introduced by my sloppy backport in Issue 16701. The other problem here is x is generally defined as any arbitrary object, but redefined as an iterable in the footnote. I think we should use t instead, as in the other two slice assignment operations and in Python 3. My commit should have fixed both these problems.

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nosy: +martin.panter
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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