[docs] [issue34839] doctest: Change example under warnings section

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

Hi Terry,

You say we need to keep this illustration with a section 'before 3.6' but in think it's a bad thing.

1. when you read a documentation, you just copy the example, and sometimes you don't read the requirements.
2. why do we need to keep an illustration for a previous version of Python? since >= 3.6 we keep the order (officially in 3.7), in this case, the example is useless, because you read the documentation of >= 3.7.

I would prefer to remove this example for >= 3.6 and keep the illustration for the previous version.

I am really interested by the feedback of Tim, Cheryl and Raymond.

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nosy: +matrixise

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