docs: Updates the Algolia DocSearch eligibility description to match DocSearch page

[ayip8]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.

Motivation

The previous documentation of the free Algolia DocSearch program only mentions open-source projects. At first this led me to believe I couldn't use it for our developer docs at Prefab (https://docs.prefab.cloud).

However, my understanding from reading https://docsearch.algolia.com/docs/who-can-apply/ is that DocSearch is free for all developer documentation, including commercial projects.

My change uses the same language as the above linked Algolia page for clarity and consistency.

Test Plan

N/A, this is only a documentation change.

Test links

Link to the changed page:
https://docusaurus.io/docs/search#using-algolia-docsearch

Related issues/PRs

N/A

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 72	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/installation	🟠 89	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/category/getting-started	🟠 77	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog	🟠 75	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 65	🟢 97	🟢 100	🟢 100	🟠 89	Report
/blog/tags/release	🟠 75	🟢 100	🟢 100	🟠 80	🟠 89	Report
/blog/tags	🟠 78	🟢 100	🟢 100	🟢 90	🟠 89	Report

[slorber]

Thanks 👍 makes sense to keep the text consistent