docs: remove unimplemented topic from React Compiler Introduction page

[pxlauf]

Summary

Remove "Using the compiler on your React library" from the "You will learn"
callout on the Introduction page, as this topic is not covered anywhere on the page.

Details

The "You will learn" box listed this bullet point but no corresponding section
existed in the page content, which could confuse readers expecting to find
that information.

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[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

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