style-guide: Add chapter about formatting for nightly-only syntax#111119

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bors merged 2 commits intorust-lang:masterfrom compiler-errors:style-nightly

Jul 6, 2023

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Commits on Jul 5, 2023

Clarify that style guide does not cover nightly-only features
compiler-errors
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style-guide: Add chapter for nightly formatting

joshtriplett
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compiler-errors
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