docs: corrected typo in search.mdx

[B0r1sD]

Typo

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

While reading the documentation, this typo caught my attention.

Test Plan

NA

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🟠 79	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🟠 50	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 69	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 47	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 68	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 75	🟢 100	🟢 100	🟠 86	Report

[netlify]

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😎 Deploy Preview	https://deploy-preview-10416--docusaurus-2.netlify.app
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