bpo-17050: Remove documentation on argparse.REMAINDER

[corollari]

Closes Issue 17050 by removing argparse.REMAINDER from the documentation, as discussed on the issue.

https://bugs.python.org/issue17050

Automerge-Triggered-By: @rhettinger

[the-knights-who-say-ni]

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@corollari

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[corollari]

I've already signed the CLA and I'm currently just waiting for it to get accepted.

Regarding the bedevere/news CI failure, I'm a bit confused by it because the docs on news blurbs states that "Changes that affect documentation only generally do not require a news entry.". Is there something I'm missing?

[eamanu]

LGTM.

[eamanu]

@corollari yes you are right, this PR does not need a NEWs.

[miss-islington]

@corollari: Status check is done, and it's a success ✅ .

[miss-islington]

Thanks @corollari for the PR 🌮🎉.. I'm working now to backport this PR to: 3.9.
🐍🍒⛏🤖

[bedevere-bot]

GH-20363 is a backport of this pull request to the 3.9 branch.