[docs] [issue30410] Documentation for sys.stdout encoding does not reflect the new Windows behavior in Python 3.6+

[Steve Dower]

Steve Dower added the comment:

Looks great, though I wonder whether the rest of the paragraph after "Character devices such as NUL" would be more confusing than it's worth?

Can you create a PR? (And having links to the environment variable docs would be great.)

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