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Auto merge of #142910 - yotamofek:pr/rustdoc/markdown-lazy-to-string, r=GuillaumeGomez
Lazy-ify some markdown rendering
Seems to have a positive effect in my local perf runs 😍
r? `@GuillaumeGomez` if you're interested, otherwise feel free to reassign
(would also love a perf run)
