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Rollup merge of #138090 - yotamofek:pr/rustdoc/flatten-ifs, r=GuillaumeGomez
`librustdoc`: flatten nested ifs
Some minor cosmetic improvements (IMHO) found while working on something else.
But reviewed with [no whitespace](https://github.com/rust-lang/rust/pull/138090/files?diff=unified&w=1).
