rustdoc: slightly clean up the synthesis of blanket impls #123647
                
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Small follow-up to #123340 as promised in #123340 (comment). No functional changes whatsoever.
BlanketImplFinderjust like I did withAutoTraitFinderin rustdoc: heavily simplify the synthesis of auto trait impls #123340synthesize_*terminology over the old nondescript / misleadingget_*oneuse super::*;(not super modular, lead toclean/mod.rs(!) accumulating cruft)tracingproperlyr? GuillaumeGomez or rustdoc