docs: broken link in release 3.0 page

[OzakIOne]

Motivation

Link is missing / at the beginning resulting in a broken link

Test Plan

Local build fixed the error

Deploy preview page

Test links

Deploy preview: https://deploy-preview-9573--docusaurus-2.netlify.app/

[netlify]

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 66	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/installation	🟠 89	🟢 98	🟢 100	🟢 100	🟠 89	Report
/docs/category/getting-started	🟠 76	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog	🟠 71	🟢 100	🟢 100	🟢 90	🟠 89	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 64	🟢 97	🟢 100	🟢 100	🟠 89	Report
/blog/tags/release	🟠 73	🟢 100	🟢 100	🟠 80	🟠 89	Report
/blog/tags	🟠 77	🟢 100	🟢 100	🟢 90	🟠 89	Report