docs: fix typo in devtools.mdx

[kciter]

Summary

Fixes a typo about markdown breaks.

Check List

• [x] pnpm run prettier for formatting code and docs

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Name	Status	Preview	Comments	Updated (UTC)
valtio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 16, 2024 4:39am

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commit: 29ba732

valtio

``` npm i https://pkg.pr.new/valtio@922 ```

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