docs: remove deprecated partial toc warning

[slorber]

Motivation

Warning is now useless because we fixed the limitation

replaces #10306

[netlify]

✅ [V2]

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🟠 64	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🟠 73	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 68	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 48	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 69	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 75	🟢 100	🟢 100	🟠 86	Report

[github-actions]

Size Change: 0 B

Total Size: 1.85 MB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/codeTranslations.json	2 B
website/.docusaurus/docusaurus.config.mjs	27.4 kB
website/.docusaurus/globalData.json	123 kB
website/.docusaurus/i18n.json	930 B
website/.docusaurus/registry.js	306 kB
website/.docusaurus/routes.js	203 kB
website/.docusaurus/routesChunkNames.json	131 kB
website/.docusaurus/site-metadata.json	2.17 kB
website/build/assets/css/styles.********.css	113 kB
website/build/assets/js/main.********.js	909 kB
website/build/index.html	38.1 kB

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[honzajavorek]

Thanks for taking over from where I dropped the ball! 🏀 🤝