docs(search): update docsearch api url

[dhayab]

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

Hi docusaurus team, here's a small doc PR which replaces the temporary link to the DocSearch API reference with the proper one.

Test Plan

N/A

Test links

Deploy preview: https://deploy-preview-10233--docusaurus-2.netlify.app/docs/search/#customizing-the-algolia-search-behavior

Related issues/PRs

None

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 69	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 65	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 65	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 67	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 71	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟢 90	🟠 88	Report

[slorber]

thanks 👍