[docs] [issue37216] mac installation document wrong for python 3.7.3

[makdon]

makdon <makdon at makdon.me> added the comment:

Thanks xtreak. I am a beginner on python mailing list and now i've learn how to get a link to the email.


And i found a version error on windows installation document on version 3.6.8 that the picture is still using version 3.5:

https://docs.python.org/3.6/using/windows.html#installation-steps

I will check them and create PR for it.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37216>
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