[Suggestion]: Cap the height of the artificially-slow example output (useDeferredValue / useTransition)

Summary

When you view the example's rendered output in full, the SlowList/SlowPost demos expand into hundreds of identical rows, which is more than anyone needs to scroll through. The output height should be capped (e.g. max-height + scroll) while keeping the item counts that create the intentional slowdown.

Page

https://react.dev/reference/react/useDeferredValue
https://react.dev/reference/react/useTransition

Details

The point of these demos is felt within the first few rows — you just need to see the list "lag behind" the input. But the rendered output shows the full list, so viewing it expands the example to hundreds of identical "Text:" rows and pushes the rest of the docs far down. The number of rows differs across pages (250 / 500 / 50), so the problem shows up unevenly.

Start with the examples on the useDeferredValue and useTransition reference pages and inspect how SlowList and SlowPost render their output. Cap the visible output height with scrolling while preserving the existing item counts and intentional slowdown, then verify both pages no longer expand excessively.