doc: fix typo in "create a doc"

[ghost]

Motivation

Micro typo.

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

Not needed.

Related PRs

none.

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[netlify]

✔️ [V2]
Built without sensitive environment variables

🔨 Explore the source changes: fc315a5

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😎 Browse the preview: https://deploy-preview-5818--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	89
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5818--docusaurus-2.netlify.app/

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[Josh-Cena]

👍 Thanks