docs: correct plugin example filename

[mem212]

The file name inside the my-plugin folder is index.js .

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	31
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

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[Josh-Cena]

@MxhDx Please remember to sign the CLA. It's required for us to merge. PRs without CLA will be closed in two weeks.

[slorber]

@MxhDx can you sign the CLA please?

[mem212]

@MxhDx can you sign the CLA please?

Hi,
Sorry for the delay, I will in the next minutes.

[mem212]

@MxhDx can you sign the CLA please?

Done.

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[Josh-Cena]

Thanks👍