Update small typo in useDeferredValue.md

[ninjaPixel]

There are 4 instances where the phrase "in background" is used on this page. I have updated these to "in the background".

For example, in the following paragraph:

During the initial render, the returned deferred value will be the same as the value you provided. During updates, React will first attempt a re-render with the old value (so it will return the old value), and then try another re-render in background with the new value (so it will return the updated value).

I have changed the final bit of text from "re-render in background" to "re-render in the background".

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Name	Status	Preview	Updated (UTC)
react-dev	✅ Ready (Inspect)	Visit Preview	Mar 2, 2024 6:22pm

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[github-actions]

Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

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[rickhanlonii]

Thanks!