docs: clarify conditional operator usage in JSX

[ChristopherJamesL]

This PR improves the wording in the Learn > Quick Start section of the docs to clarify how conditional rendering works in JSX.

The previous text could be interpreted to mean that if cannot be used with JSX at all. This change clarifies that the conditional (? :) operator can be used inline inside JSX, which more accurately reflects how JSX expressions work.

Fixes #8247

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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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