[docs] [issue29974] Change typing.TYPE_CHECKING doc example

[Berker Peksag]

Berker Peksag added the comment:

87c07fe9d908d0a2143fcc8369255c6ff3241503 should still be backported to 3.5 and 3.6 branches so please don't close it yet.

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resolution: fixed -> 
stage: resolved -> backport needed
status: closed -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29974>
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