Rollup merge of #99337 - jsha:simplify-highlight, r=GuillaumeGomez

rustdoc: simplify highlight.rs

Split render_with_highlighting, which took many optional parameters, into three functions for specific purposes, which each take a smaller number of mostly required parameters.

Remove some plumbing to pass through an "edition" parameter, which was used solely to avoid highlighting some 2021 Edition keywords in non-2021 code.

I've tested a build of std docs before and after, and this does not change the generated HTML at all.

Followup from https://github.com/rust-lang/rust/pull/91264#discussion_r901151101

r? ``@GuillaumeGomez``
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Dylan DPC 2022-08-11 11:14:52 +05:30 committed by GitHub
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