docs: fix typo 'validationOptions'

[gracefullight]

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

Fix typos for example codes

Test Plan

Test links

• https://deploy-preview-8548--docusaurus-2.netlify.app/docs/api/plugin-methods/
• https://deploy-preview-8548--docusaurus-2.netlify.app/docs/api/plugin-methods/static-methods

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
/	🟢 94	🟢 97	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 76	🟢 100	🟢 100	🟢 100	🟢 90	Report

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[Josh-Cena]

Thanks! Good catch.