fix typos in turbo module docs

[pooriamo]

This PR only fixes a couple of small typos in the doc in this page:

http://localhost:3000/docs/next/the-new-architecture/native-modules-custom-events

I just edited all occurances also in the "versioned" files. I hope it's correct.

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[Simek]

Hey @pooriamo, thanks for all of the corrections, and backporting the changes to the versioned docs! 👌