misc: fix ungrammatical sentence about 5-min tutorial

[hughlilly]

Motivation

This fixes a small grammatical error in the Readme.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

n/a

Related PRs

n/a

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[netlify]

✔️ [V2]
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🔨 Explore the source changes: 7fe0b97

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	97
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5573--docusaurus-2.netlify.app/

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

[lex111]

@hughlilly thanks!