Fix two typos in CHANGELOG.md

[owenarthur]

Summary

This fixes two small typos in the v19.0.0 CHANGELOG.md entry.

How did you test this change?

N/A

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 5, 2024 8:37pm

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[eps1lon]

Thank you. I also incorporated these changes into https://github.com/facebook/react/releases/tag/v19.0.0

[eps1lon]

Can you sign the CLA check so that we can merge this?

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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!

[kachkaev]

It’d be also great to fix heading levels if it’s not too late: #31675 (comment)

[eps1lon]

@kachkaev Can you file a PR for that?

[kachkaev]

@kachkaev Can you file a PR for that?

#31683