Clarify close as not planned for triage

[willingc]

Clarify the close step in the triage checklist. TIL from @erlend-aasland. 👍🏼

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📚 Documentation preview 📚: https://cpython-devguide--1186.org.readthedocs.build/

[zware]

If there's a canonical link to GitHub documentation about how to use that option, it might be a good idea to link the new text to it. I've seen several people not realize that the dropdown on the close button offered options (or even existed).

[AlexWaygood]

If there's a canonical link to GitHub documentation about how to use that option, it might be a good idea to link the new text to it. I've seen several people not realize that the dropdown on the close button offered options (or even existed).

There's some docs here that provide a screenshot: https://docs.github.com/en/issues/tracking-your-work-with-issues/closing-an-issue

Though actually, the blog post here announcing the feature is even better: https://github.blog/changelog/2022-03-10-the-new-github-issues-march-10th-update/#🕵🏽♀%EF%B8%8F-issue-closed-reasons