Rollup merge of #161340 - notriddle:rustdoc-overflow, r=lolbinarycat,GuillaumeGomez

rustdoc: enable scrolling only on table/code

This is a fix for a problem that hit `<ol>`, where the digits were truncated at the edge of the scroll container.

Fixes https://github.com/rust-lang/rust/issues/161144

<img width="1552" height="923" alt="Screenshot 2026-08-18 at 21 08 12" src="https://github.com/user-attachments/assets/4825a756-0068-42e8-99f2-8a57cc17f234" />

None of this code was written with an LLM, but, supposedly, one was used in the above issue thread for root cause analysis.