Rollup merge of #112942 - joshtriplett:style-guide-tweaks, r=compiler-errors

style-guide: Organizational and editing tweaks (no semantic changes)

I'd recommend reviewing this PR commit-by-commit; each commit is self-contained
and should be easy to review at a glance.

- style-guide: Move text about block vs visual indent to indentation section
- style-guide: Move and expand text about trailing commas
- style-guide: s/right-ward/rightward/
- style-guide: Consistently refer to rustfmt as `rustfmt`
- style-guide: Remove inaccurate statement about rustfmt
- style-guide: Define (and capitalize) "ASCIIbetically"
- style-guide: Update cargo.md for authors being optional and not recommended
- style-guide: Avoid normative recommendations for formatting tool configurability
- style-guide: Clarify advice on names matching keywords
- style-guide: Reword an awkwardly phrased recommendation (and fix a typo)
- style-guide: Rephrase a confusingly ordered, ambiguous sentence (and fix a typo)
- style-guide: Avoid hyphenating "semicolon"
- style-guide: Make link text in SUMMARY.md match the headings in the linked pages
- style-guide: Define what an item is
- style-guide: Avoid referring to the style team in the past tense

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