Update what-is-codegen.md document to improve grammar and readability

[AshishGapat]

• Fix grammar
• Remove unnecessary emphasis
• Add URL to Turbo Native Modules

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[Simek]

Hey @AshishGapat, thanks for the updates! 👍

Can you also edit the unversioned file for that docs located at:

• https://github.com/facebook/react-native-website/blob/main/docs/the-new-architecture/what-is-codegen.md

And let's use internal link, as mentioned in the comment below.

[AshishGapat]

Hey @Simek, thank you for taking the time to review. I've made these changes. Please excuse the multiple commits, I could not do git commit --amend as I did the changes on Github web, not locally.

[Simek]

No worries! Can we also correct the link in versioned file?

[AshishGapat]

Ah, of course. Fixed it. Thanks again!