Doc formating consistency between slice sort and sort_unstable, and big O notation consistency#77969

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bors merged 2 commits intorust-lang:masterfrom

ryan-scott-dev:bigo-notation-consistency

Oct 23, 2020

Commits on Oct 15, 2020

Made slice sort documentation consistent between stable and unstable versions
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Following #74010 by converting some newer cases of backticked O notations to be italicized
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