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Rollup merge of #157633 - CoCo-Japan-pan:impl-restriction-render-fix, r=GuillaumeGomez
Reorder `impl` restriction rendering and add bottom margin
This PR moves the `impl` restriction rendering above the trait description.
It also adds an ⓘ marker, italicizes the text, and adds a bottom margin.
Tracking issue: rust-lang/rust#105077
before:
<img width="1108" height="651" alt="image" src="https://github.com/user-attachments/assets/520d95cf-a648-44e7-8036-e453cfbdf569" />
after:
<img width="1085" height="671" alt="image" src="https://github.com/user-attachments/assets/84493e56-6227-433b-93d0-4fcbe28ac00c" />
r? @GuillaumeGomez
cc @Urgau @jhpratt
