bpo-31571: Removing redundant information (Docs)

[gpkc]

Removing some stuff that is said twice.

https://bugs.python.org/issue31571

[the-knights-who-say-ni]

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[gpkc]

Forgot I had to sign this agreement... Just did it.

[serhiy-storchaka]

Where it is said the first time?

A PR which is not trivial (fixing a typo or like) needs an issue on the Python bug tracker for discussion. Please open an issue and add the "bpo-XXXXX:" prefix to a title.

[gpkc]

@serhiy-storchaka Okay, done. What would be a trivial PR then?

[serhiy-storchaka]

https://github.com/python/cpython/pulls?page=2&q=is%3Apr+label%3A%22skip+issue%22+is%3Aclosed

As for this issue, duplications are located distant one from other, it is not obvious what copy should be kept or both. This PR could be trivial for the author of changes which know his intention.

[miss-islington]

Thanks @gpkc for the PR, and @Mariatta for merging it 🌮🎉.. I'm working now to backport this PR to: 3.6.
🐍🍒⛏🤖

[bedevere-bot]

GH-3754 is a backport of this pull request to the 3.6 branch.

[Mariatta]

Thanks @gpkc and congrats on your first contribution to CPython 🌮