[docs] [issue32553] venv says to use python3 which does not exist in 3.6.4

Eryk Sun eryksun@gmail.com added the comment:

`PATHEXT` is irrelevant here, so that should be removed. As to the py launcher, it's optional and not always installed for all users, though that's the default. I'd prefer `python` that's found in PATH as the first example. Then add another example with `py -X.Y` to show how to create virtual environments for other versions.

---------- nosy: +eryksun

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