[docs] [issue8840] truncate() semantics changed in 3.1.2

[Berker Peksag]

Berker Peksag added the comment:

The patch looks good to me, but perhaps we should make these docstrings shorter and refer people to the actual documentation for details? We recently did this in subprocess and venv modules.

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nosy: +berker.peksag, martin.panter
stage: needs patch -> patch review
versions: +Python 3.6, Python 3.7 -Python 3.4

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